In cache_inode_dec_pin_ref, close file when refcount goes to 0. A parameter is added
to only allow nlm_Unshare to utilize this logic.

Conflicts:

	src/SAL/nfs4_state.c
	src/SAL/state_lock.c
	src/SAL/state_share.c
	src/include/cache_inode_lru.h

Signed-off-by: rong zeng <rongzeng@us.ibm.com>