Branch b1_4

Branch b1_4
Add liblustre_wait_event() calls before entering all liblustre API functions
to ensure that pending ASTs from LDLM_FL_CANCEL_ON_BLOCK locks are handled
before we do any local lock matching.  Also add liblustre_wait_event() calls
just before exiting Lustre code to handle any remaining items before returning
to the uninterruptible client code.
b=9352, b=7313
r=green