* srsepc.conf.tmpl: zero-pad mnc and mcc in config
* jenkins-build-srslte.sh: pass extra configuration_opts to build_repo
* enb_amarisoft: add support for PHY signal log file
* srsue.conf.tmpl: use UE cat 8 whenever more than one carrier is configured
* rfemu_minicircuits: reset attenuation to zero in dtor
* enb_amarisoft: add option to enable and configure DL AWGN channel