wait_for_connection: also retry interpreter discovery (#67040)

self._discovered_interpreter_key is None unless a previous iteration
has attempted discovery.  In that case, force re-discovery, as the
previous attempt certainly failed.

changelogs/fragments/wait_for_connection-interpreter-discovery-retry.yaml

@@ -0,0 +1,4 @@
+---
+bugfixes:
+- wait_for_connection - with pipelining enabled, interpreter discovery would
+  fail if the first connection attempt was not successful

lib/ansible/plugins/action/wait_for_connection.py

@@ -79,6 +79,9 @@ class ActionModule(ActionBase):
         def ping_module_test(connect_timeout):
             ''' Test ping module, if available '''
             display.vvv("wait_for_connection: attempting ping module test")
+            # re-run interpreter discovery if we ran it in the first iteration
+            if self._discovered_interpreter_key:
+                task_vars['ansible_facts'].pop(self._discovered_interpreter_key, None)
             # call connection reset between runs if it's there
             try:
                 self._connection.reset()