software/ors-amarisoft: Add xamari xlog service
Add a service that runs xamari xlog stats[samples,rf]/<period>s in enb / gnb instance.
For now the resulting logfile enb.xlog / gnb.xlog is put in monitor public folder so as to be served by monitor http server.
Optionally the service also includes x.drb_stats/<period>s, which implies 100Hz polling. This is enabled by default.