* Add username and password to handle_auth and update exception message
Revise naming of ldap username and password
* Add url for LDAP and userpass to method_auth
* Add information regarding LDAP and username and password to credential plugins documentation
Revise ldap_auth to userpass_auth and revised exception to better reflect functionality
* Revise method_auth to ensure certs can be used with username and ensure namespace functionality is not hindered