WFLY-1359 Add full support for replacing application libraries

Libraries can now be replaced in ear/lib as well as WEB-INF/lib,
and new libraries can be added.
[WFLY-2918] Allow undefined for domain-controller/remote host and port
[WFLY-2917] Improve logging related to slave HC connecting to master
Correct domain-controller/remote parsing
WFLY-2938 JASPIAuthenticationMechanism does not perform the is auth required check correctly
Fix typo when user already exists

Change "User '%s' already exits" into "User '%s' already exists".