Add change log for v1.7.3

doc/changelog_1_7_3.md

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+# Change log for LCI v1.7.3
+
+## Major Changes
+- Integrate PAPI into LCI.
+  - Use cmake option LCI_USE_PAPI to enable.
+  - Use env var LCI_PAPI_EVENTS to specify events to monitor.
+- Add pmix support for LCI.
+- Update README, doxygen comments, and example codes.
+
+## Breaking Changes
+- Change uint32_t rank to int rank in sendl/recvl to match other
+  communication operations.
+
+## Other Changes
+- Add cmake option LCI_IBV_ENABLE_TRY_LOCK_QP.
+- Use thread domain when try_lock is enabled.
+- Add more performance counters.
+- Only print performance counter data when 
+  LCI_USE_PERFORMANCE_COUNTERS is enabled.
+- Add cmake option LCI_ENABLE_SLOWDOWN and env var 
+  LCI_SEND_SLOW_DOWN_USEC and LCI_RECV_SLOW_DOWN_USEC: 
+  manually slow down the messages.
+- Change the putva rendezvous protocol: first send FIN and then 
+  deregister memory.
+- Make LCI_PACKET_SIZE configurable at runtime.
+- Add some log to help debug the hang (if there is any) in the 
+  initialization phase.
+- Only do fetch_and_add on g_next_rdma_key when FI_MR_PROV_KEY is 
+  not set.
+- Use the msg_comp_type as the remote default completion type 
+  instead of the hardcoded LCI_COMP_QUEUE.
+- Use CSV format for performance counter printing outputs.
+
+## Fixed Issues
+- Fix LCIU_timespec_diff.
+- Fix a few alignment bugs.
+- Fix a bug in ibv backend when td is not supported.
+- Fix a putva bug: putva send buffers might never get freed.
+- Fix LCI_TOUCH_LBUFFER when allocating long buffers.
+- Fix compiler non-void function no return error.
+- Provides workaround for libfabric/cxi fi_mr_bind bug.
+- Fix the handler completion mechanism.