Changes to convert to unicode at the borders

The module docs and vault changes solve issues where tracebacks can
happen.  The galaxy changes are mostly refactoring to be more pythonic
with a small chance that a unicode traceback could have occurred there
without the changes.  The change in __init__.py when we actually call
the pager makes things more robust but could hide places where we had
bytes coming in already so I didn't want to change that without auditing
where the text was coming from.

Fixes #14178

lib/ansible/cli/__init__.py

@@ -459,7 +459,7 @@ class CLI(object):
             os.environ['LESS'] = CLI.LESS_OPTS
         try:
             cmd = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=sys.stdout)
-            cmd.communicate(input=text.encode(sys.stdout.encoding))
+            cmd.communicate(input=to_bytes(text))
         except IOError:
             pass
         except KeyboardInterrupt: