staging: lustre: llite: Delaying creation of client side proc entries.

In client_common_fill_super() proc entries are created before
before cl_sb_init() and therefore lu_site is not allocated resulting
in client crash when tried reading lu_site stats.
Delaying creation of proc entries after creation of all required data
structures fixed the problem.

Signed-off-by: Gaurav Mahajan <gmahajan@ddn.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2941
Reviewed-on: http://review.whamcloud.com/6852


Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>