Fixed usages of strtok to use strtok_r instead

Fixed usages of strtok to use strtok_r instead

strtok is not thread safe and has a global state variable that
have serious side effects.  If any consumer of ours was to use
threads and strtok they could very easily corrupt the state on us
(or us on them!).  This fix replaces it with the non-side effect
POSIX version, which is strtok_r.  Note that in occollection.c
we are already using strtok_r.

Change-Id: Ie39a2a2ab35a0b1f13a82542ef6963662ac5c53e
Signed-off-by: Erich Keane <erich.keane@intel.com>