LU-10752 build: properly package lsvcgss for rpm builds

LU-10752 build: properly package lsvcgss for rpm builds

On some platforms rpm building will failure with the following
errors:

RPM build errors:
    Installed (but unpackaged) file(s) found:
   /etc/init.d/lsvcgss

Technically lsvcgss is a server only file so we can just include
it for server builds and only if GSS_KEYRING is set.

Test-Parameters: trivial

Change-Id: I2525916cd10ddea0b99337e1ff4ff967bd9f7f9a
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/31485
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>