certifi dropped Python 2 support (#4702)

* certifi dropped Python 2 support.

* Apparently the consul tests didn't use the constraints.

tests/integration/targets/consul/meta/main.yml

@@ -3,3 +3,4 @@ dependencies:
   - setup_pkg_mgr
   - setup_openssl
   - setup_remote_tmp_dir
+  - setup_remote_constraints

tests/integration/targets/consul/tasks/main.yml

@@ -12,12 +12,14 @@
   - name: Install requests<2.20 (CentOS/RHEL 6)
     pip:
       name: requests<2.20
+      extra_args: "-c {{ remote_constraints }}"
     register: result
     until: result is success
     when: ansible_distribution_file_variety|default() == 'RedHat' and ansible_distribution_major_version is version('6', '<=')
   - name: Install python-consul
     pip:
       name: python-consul
+      extra_args: "-c {{ remote_constraints }}"
     register: result
     until: result is success
   - name: Generate privatekey