LU-1345 tests: sanity test 215 non integer handling fix

LU-1345 tests: sanity test 215 non integer handling fix

Sanity test 215 test the format of various /proc/sys/lnet/* files.
Some of those files are integer values but their can be times when
no valid number is available so a NA is reported. This patch
handles those cases.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I2c9ae2c56d7864099cddb456b998356f0f7c32b2
Reviewed-on: http://review.whamcloud.com/2602
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>