gluster: Reset statusconflict flag on enable/disable

Reset the status conflict flag on enable/disable
of gluster hooks. After resetting of flag, if
conflict status is 0, remove the entries of
conflicting server hooks as conflicts have been
resolved

Removed code that added entries to server hooks
as we now only maintain conflicting server hook
entries

Refactored the command class to use
GlusterHookParameters class.

Change-Id: I9913900175e0f5be33bb1ec45b882e770a09fde4
Signed-off-by: Sahina Bose <sabose@redhat.com>