LU-3319 procfs: move ost proc handling over to seq_file

LU-3319 procfs: move ost proc handling over to seq_file

Most of the current proc handling of the OST is already
based on seq_file handling except for the reporting of
the UUID of the OST. This patch moves this last piece
so that the OST layer will use strictly proc files with
seq_files.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Idf2bc014ada9292d545f761aa27c777412a66671
Reviewed-on: http://review.whamcloud.com/7928
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>