LU-2709 build: fix 'memory corruption' errors

LU-2709 build: fix 'memory corruption' errors

Fix 'memory corruption' defects found by Coverity version 6.5.0:
Out-of-bounds access (OVERRUN_STATIC)
Overrunning static array by passing it to a
function which indexes it at a higher byte position.
Unbounded source buffer (STRING_SIZE)
Passing string of unknown size to a function that expects
a string of a particular size.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: Iabc9bd7609d285a3709737748f2100b90769d795
Reviewed-on: http://review.whamcloud.com/5210
Tested-by: Hudson
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>