fixes for ansible.cfg, inmem-test.yml; add ansible.posix to collection requirements.yml for task profiling

ansible.cfg

@@ -15,9 +15,10 @@ timeout                 = 30
 host_key_checking       = False
 display_skipped_hosts   = False
 interpreter_python      = auto_silent
-#bin_ansible_callbacks   = True
-#callbacks_enabled       = yaml, timer, profile_tasks
+bin_ansible_callbacks   = True
+callback_whitelist      = profile_tasks
 deprecation_warnings    = False
+command_warnings        = False
 
 
 [ssh_connection]