Addshore authored May 08, 2021 and Addshore committed May 12, 2021

Change summary:
 - No longer have mediawiki writing a LS.php file with the wrong
   permissions.
 - Add a check to make sure a correct looking LS.php exists before
   allowing install via mwdd.
 - If NO LS.php files exists at all, then create one for the user.
 - If a LS.php exists, but doesn't have our shim, tell the user.
 - Use a nice server option when installing so the output makes sense
   to the user (rather than just saying localhost)
 - Switch from arguments to flags for mediawiki install

This includes some small refactoring and additions to the mediawiki
package which is used by both the docker and mwdd command.

Change-Id: I2253730996c2969e775d3e77cf376cb1ebd67363