scm: cr_thread occasionally segv's when disconnecting all-to-all MPI static connections

scm: cr_thread occasionally segv's when disconnecting all-to-all MPI static connections

Note: no valid calltrace for segv on cr_thread because
of state changing in switch statement from another
thread, jumped unknown location.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x41a65940 (LWP 1328)]
0x00002b2e7d9d5134 in ?? ()

Add cm object locking on all state change/checking. When
freeing CM object wakeup cr_thread to process
state change to CM_FREE.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>