Removing vdsm configuration when removing vdsm service

Before we removed that section only over rhel and we looked for the
wrong string. This patch adds sed command for both dist with the current
string that is written by vdsmd init script.

Change-Id: Ia8f59375e20efa6b5de8483a12a772f5f0ce3749
Bug-Id: https://bugzilla.redhat.com/show_bug.cgi?id=902346
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11295
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Douglas Schilling Landgraf <dougsland@redhat.com>