VMware: New module: vmware_guest_snapshot_facts (#36002)

This module gathers facts about VM's snapshots.

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

test/integration/targets/vmware_guest_snapshot_facts/aliases

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+posix/ci/cloud/group4/vcenter
+cloud/vcenter
+destructive

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

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+# Test code for the vmware_host_dns_facts module.
+# Copyright: (c) 2018, Abhijeet Kasurde <akasurde@redhat.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+# TODO: vcsim does not support snapshot related functionalities
+
+# - name: make sure pyvmomi is installed
+#   pip:
+#     name: pyvmomi
+#     state: latest
+#   when: ansible_user_id == 'root'
+# 
+# - name: store the vcenter container ip
+#   set_fact:
+#     vcsim: "{{ lookup('env', 'vcenter_host') }}"
+# - debug: var=vcsim
+# 
+# - name: Wait for Flask controller to come up online
+#   wait_for:
+#     host: "{{ vcsim }}"
+#     port: 5000
+#     state: started
+# 
+# - name: kill vcsim
+#   uri:
+#     url: "{{ 'http://' + vcsim + ':5000/killall' }}"
+# - name: start vcsim with no folders
+#   uri:
+#     url: "{{ 'http://' + vcsim + ':5000/spawn?datacenter=1&cluster=1&folder=1' }}"
+#   register: vcsim_instance
+# 
+# - name: Wait for Flask controller to come up online
+#   wait_for:
+#     host: "{{ vcsim }}"
+#     port: 443
+#     state: started
+# 
+# - name: get a list of VMS from vcsim   
+#   uri:
+#     url: "{{ 'http://' + vcsim + ':5000/govc_find?filter=VM' }}"
+#   register: vmlist
+# 
+# - set_fact:
+#     vm1: "{{ vmlist['json'][0] }}"
+# 
+# - name: get a list of datacenters from vcsim
+#   uri:
+#     url: "{{ 'http://' + vcsim + ':5000/govc_find?filter=DC' }}"
+#   register: datacenters
+# 
+# - set_fact:
+#     dc1: "{{ datacenters['json'][0] }}"
+# 
+# - debug: var=vcsim_instance
+# - debug: var=vmlist
+# - debug: var=vm1
+# - debug: var=dc1
+#
+# - name: Gather snapshot facts about given virtual machine
+#   vmware_guest_snapshot_facts:
+#     validate_certs: False
+#     hostname: "{{ vcsim }}"
+#     username: "{{ vcsim_instance['json']['username'] }}"
+#     password: "{{ vcsim_instance['json']['password'] }}"
+#     datacenter: "{{ dc1 | basename }}"
+#     folder: "{{ vm1 | dirname }}"
+#   register: vm_snapshot_facts
+
+# - debug: vm_snapshot_facts
+
+# - assert:
+#     that:
+#       - "not vm_snapshot_facts.changed"