Backport of pmrun.py: Recreate the older behavior where the entire success command was quoted (#67241)

* pmrun - quote success command (#66929)

* Recreate the older behavior where the entire success command was quoted

* Use shlex_quote for a correct fix of this

* Add changelog fragment

(cherry picked from commit fd8eb77cc3)

* Backport of 66929-pmrun-quote-entire-success-command-string

* Update changelog fragment

* Delete 66929-pmrun-quote-entire-success-command-string.yml

Unclear from docs, but this is the devel fragment so removing.

* Update changelog

changelogs/fragments/67241-pmrun-quote-entire-success-command-string.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - pmrun plugin - The success command string was no longer quoted. This caused unusual use-cases like ``become_flags=su - root -c`` to fail.

lib/ansible/plugins/become/pmrun.py

@@ -57,6 +57,7 @@ DOCUMENTATION = """
 """
 
 from ansible.plugins.become import BecomeBase
+from ansible.module_utils.six.moves import shlex_quote
 
 
 class BecomeModule(BecomeBase):
@@ -72,4 +73,4 @@ class BecomeModule(BecomeBase):
 
         become = self.get_option('become_exe') or self.name
         flags = self.get_option('become_flags') or ''
-        return '%s %s %s' % (become, flags, self._build_success_command(cmd, shell))
+        return '%s %s %s' % (become, flags, shlex_quote(self._build_success_command(cmd, shell)))