Adds docker_secret module (#26469)

test/integration/targets/docker_secret/aliases

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+posix/ci/group2
+skip/osx
+skip/freebsd

test/integration/targets/docker_secret/handlers/main.yml

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+- name: disable_swarm 
+  command: docker swarm leave --force
+  ignore_errors: yes

test/integration/targets/docker_secret/tasks/Fedora.yml

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+- name: Install Docker pre-reqs
+  dnf:
+    name: "{{ item }}"
+    state: present
+  items:
+    - dnf-plugins-core 
+
+- name: Add repository
+  command: dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
+
+- name: Update cache
+  command: dnf makecache fast 
+
+- name: Install docker
+  dnf:
+    name: docker-ce
+    state: present

test/integration/targets/docker_secret/tasks/OpenSuse.yml

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+- name: Template repo
+  template:
+    src: virt.repo.j2
+    dest: /etc/zypp/repos.d/virt.repo
+
+- name: Install docker 17
+  zypper:
+    name: docker-17.04.0_ce-203.6.x86_64
+    force: yes
+    disable_gpg_check: yes
+    update_cache: yes

test/integration/targets/docker_secret/tasks/RedHat.yml

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+- name: Install Docker pre-reqs
+  yum:
+    name: "{{ item }}"
+    state: present
+  items:
+    - yum-utils
+    - device-mapper-persistent-data
+    - lvm2
+    - python-crypto
+    - libseccomp
+
+- name: Add repository
+  command: yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+
+- name: Update cache
+  command: yum -y makecache fast
+
+- name: Install docker
+  yum:
+    name: docker-ce
+    state: present

test/integration/targets/docker_secret/tasks/Ubuntu.yml

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+- name: Get OS version
+  shell: uname -r
+  register: os_version
+
+- name: Install packages for Trusty
+  apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: yes
+  with_items:
+  - "linux-image-extra-{{ os_version.stdout }}"
+  - linux-image-extra-virtual 
+  when: ansible_distribution_release == 'trusty'
+
+- name: Install pre-reqs
+  apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: yes
+  with_items:
+  - apt-transport-https
+  - ca-certificates
+  - curl
+  - software-properties-common
+
+- name: Add gpg key
+  shell: curl -fsSL https://download.docker.com/linux/ubuntu/gpg >key && apt-key add key
+
+- name: Add Docker repo
+  shell: add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"  
+
+- name: Install Docker CE
+  apt:
+    name: docker-ce
+    state: present
+    update_cache: yes

test/integration/targets/docker_secret/tasks/main.yml

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+- include: RedHat.yml
+  when: ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora' and ansible_distribution_major_version != '6'
+
+- include: Fedora.yml 
+  when: ansible_distribution == 'Fedora'
+
+- include: OpenSuse.yml
+  when: ansible_os_family == 'Suse'
+
+- include: Ubuntu.yml
+  when: ansible_os_family == 'Debian'
+
+- include: test_secrets.yml
+  when: ansible_os_family != 'RedHat' or ansible_distribution_major_version != '6'

test/integration/targets/docker_secret/tasks/test_secrets.yml

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+- name: Install Python requirements
+  pip:
+    state: present 
+    name: "{{ item }}"
+  with_items:
+    - docker>=2.1.0
+
+- name: Check if already in swarm
+  shell: docker node ls 2>&1 | grep 'docker swarm init'
+  register: output
+  ignore_errors: yes 
+
+- name: Enable swarm mode
+  command: docker swarm init
+  when: output.rc == 0
+  notify: disable_swarm 
+
+- name: Parameter name should be required
+  docker_secret:
+    state: present
+  ignore_errors: yes
+  register: output
+
+- name: assert failure when called with no name
+  assert:
+    that:
+       - 'output.failed'
+       - 'output.msg == "missing required arguments: name"'
+
+- name: Test parameters
+  docker_secret:
+    name: foo
+    state: present
+  ignore_errors: yes
+  register: output
+
+- name: assert failure when called with no data
+  assert:
+    that:
+       - 'output.failed'
+       - 'output.msg == "state is present but the following are missing: data"'
+
+- name: Create secret
+  docker_secret:
+    name: db_password
+    data: opensesame!
+    state: present
+  register: output
+
+- name: Create variable secret_id 
+  set_fact:
+    secret_id: "{{ output.secret_id }}"
+
+- name: Inspect secret
+  command: "docker secret inspect {{ secret_id }}"
+  register: inspect
+
+- debug: var=inspect
+
+- name: assert secret creation succeeded
+  assert:
+    that:
+       - "'db_password' in inspect.stdout"
+       - "'ansible_key' in inspect.stdout"
+
+- name: Create secret again
+  docker_secret:
+    name: db_password
+    data: opensesame!
+    state: present
+  register: output
+
+- name: assert create secret is idempotent
+  assert:
+    that:
+       - not output.changed
+
+- name: Update secret
+  docker_secret:
+    name: db_password
+    data: newpassword!
+    state: present
+  register: output
+
+- name: assert secret was updated
+  assert:
+    that:
+       - output.changed
+       - output.secret_id != secret_id
+
+- name: Remove secret
+  docker_secret:
+    name: db_password
+    state: absent
+
+- name: Check that secret is removed
+  command: "docker secret inspect {{ secret_id }}"
+  register: output
+  ignore_errors: yes
+
+- name: assert secret was removed 
+  assert:
+    that:
+      - output.failed 

test/integration/targets/docker_secret/templates/virt.repo.j2

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+[Virtualization_containers]
+name=Virtualization:containers (openSUSE_Tumbleweed)
+type=rpm-md
+baseurl=http://download.opensuse.org/repositories/Virtualization:/containers/openSUSE_Tumbleweed/
+gpgcheck=1
+gpgkey=http://download.opensuse.org/repositories/Virtualization:/containers/openSUSE_Tumbleweed//repodata/repomd.xml.key
+enabled=1