LU-7366 build: resolve compile issues on Ubuntu 15.04

LU-7366 build: resolve compile issues on Ubuntu 15.04

Ubuntu 15.04 has been released which uses a 4.2 kernel
and gcc 5.2. The gcc version fails to build lustre due
to missing headers in the GSS userland code and a
variable not being uninitialized in the llite layer.

Change-Id: I3615414ac039277a6ef6c6af1a541590b9d79566
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: http://review.whamcloud.com/17008
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>