Merge branch 'rpma-add-support-for-libpmem2-to-the-librpma-engine' of https://github...

* 'rpma-add-support-for-libpmem2-to-the-librpma-engine' of https://github.com/ldorau/fio:
  rpma: add support for libpmem2 to librpma engine in GPSPM mode
  rpma: add support for libpmem2 to librpma engine in APM mode
  rpma: simplify server_cmpl_process()