moving functional tests to prepare for auth tests

moved the actual tests to generic folder and created
an auth dir that will contain specific tests and configuration
files for each authentication service

Change-Id: I80debb917a53c3f56629b92cf5e7157da916d223
Signed-off-by: Thiago da Silva <thiago@redhat.com>
Reviewed-on: http://review.gluster.org/6140
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>