Adding back capability to display warnings contained in results

Fixes #11255

lib/ansible/plugins/callback/default.py

@@ -19,6 +19,7 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+from ansible import constants as C
 from ansible.plugins.callback import CallbackBase
 
 class CallbackModule(CallbackBase):
@@ -71,6 +72,11 @@ class CallbackModule(CallbackBase):
             msg += " => %s" % self._dump_results(result._result, indent=indent)
         self._display.display(msg, color=color)
 
+        # display warnings, if enabled and any exist in the result
+        if C.COMMAND_WARNINGS and 'warnings' in result._result and result._result['warnings']:
+            for warning in result._result['warnings']:
+                self._display.display("warning: %s" % warning, color='purple')
+
     def v2_runner_on_skipped(self, result):
         msg = "skipping: [%s]" % result._host.get_name()
         if self._display.verbosity > 0 or 'verbose_always' in result._result: