LU-9325 obdclass: handle strings correctly in lmd_find_delimiter

LU-9325 obdclass: handle strings correctly in lmd_find_delimiter

The feedback from the pushing of the lmd_find_delimiter() work
upstream was not to directly parse the string data passed in.

Change the return value to a bool and return true when the
character is found. Currently even though this function is
named lmd_find_delimiter() it return 1 when nothing is found
which is counter intuitive. Use strcspn() to determine the
position where the first delimiter is found. Add a test to
make sure the mount string is valid.

Change-Id: I7ef53f29a6d3284acd01225c115712d3674e8435
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/26558
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>