[stable-2.10] Fix pip integration test.

- Use `fallible==0.0.1a2` instead of `black==19.10b`
- Test on both Python 2 and 3.
(cherry picked from commit b6725ec6c9)

Co-authored-by: Matt Clay <matt@mystile.com>

test/integration/targets/pip/tasks/pip.yml

@@ -547,27 +547,24 @@
 # https://github.com/ansible/ansible/issues/68592
 # Handle pre-release version numbers in check_mode for already-installed
 # packages.
-# TODO: Limiting to py3 test boxes for now so the example of 'black' installs,
-# we should probably find another package to use with a similar versioning
-# scheme or make a small one and enable this test for py2 as well.
 - block:
-  - name: Install a beta version of a package
+  - name: Install a pre-release version of a package
     pip:
-      name: black
+      name: fallible
-      version: 19.10b0
+      version: 0.0.1a2
       state: present
 
   - name: Use check_mode and ensure that the package is shown as installed
     check_mode: true
     pip:
-      name: black
+      name: fallible
       state: present
     register: pip_prereleases
 
-  - name: Uninstall the beta package if we need to
+  - name: Uninstall the pre-release package if we need to
     pip:
-      name: black
+      name: fallible
-      version: 19.10b0
+      version: 0.0.1a2
       state: absent
     when: pip_prereleases is changed
 
@@ -575,6 +572,4 @@
       that:
         - pip_prereleases is successful
         - pip_prereleases is not changed
-        - '"black==19.10b0" in pip_prereleases.stdout_lines'
+        - '"fallible==0.0.1a2" in pip_prereleases.stdout_lines'
-
-  when: ansible_python.version.major == 3