LU-3331 obdclass: return errors from class_procfs_init()

LU-3331 obdclass: return errors from class_procfs_init()

In class_procfs_init() if /proc/fs/lustre/ or /proc/fs/lustre/devices
cannot be created then cleanup and return an error.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I236a4af31c44b73207d411c02873c10ee7478ca7
Reviewed-on: http://review.whamcloud.com/11935
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>