WFLY-743 Ability to enable/disable a user

add-user script has now the ability to enable or disable a user with the
command line arguments --enable and --disable.
When enabling or disabling an existing user, the password is not required. Ex :
./add-user.bat -u ggrossetie --disable
WFLY-743 Ability to enable/disable a user in interactive mode
[WFLY-456] Try not to audit log calls that go to the management layer
[WFLY-490][WFLY-456] Move determining if methods are read only, and desicion of whether to log to PluggableMBeanServer
[WFLY-490] rbac for the jmx subsystem. Needs tests
[WFLY-490] Make sensitivity of core mbeans configurable in the model. Transformers
[WFLY-456][WFLY-490] Refactor audit log handler test to not use platform mbean server
[WFLY-490] rbac jmx tests
[WFLY-490] Add ACCESS_CONTROL constraint to whether core mbeans are sensitive or not