LU-2675 mgc: remove libmgc.c

LU-2675 mgc: remove libmgc.c

Remove the liblustre specific file lustre/mgc/libmgc.c.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I4412c9d27108f4230fb351f24d6a05b2cb98fa19
Reviewed-on: http://review.whamcloud.com/11772
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathan Rutman <nathan.rutman@seagate.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>