Fixed several bugs in libhns:
libhns: Add error logs to help diagnosis
libhns: Fix coredump during QP destruction when send_cq == recv_cq
libhns: Fix memory leakage when DCA is enabled
libhns: Fix the exception branch of wr_start() is not locked
libhns: Fix reference to uninitialized cq pointer
libhns: Fix out-of-order issue of requester when setting FENCE
