vdsmd.init.in: fix some style problems

Add quotes to variable references. Use configurable variable instead of
hard coded utility path. Uniform the block statement style.

Change-Id: I1efa4b91c96249a28ca40ccdd045864fbb79e316
Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Reviewed-on: http://gerrit.ovirt.org/16809
Reviewed-by: Dan Kenigsberg <danken@redhat.com>