Remove TUN interface name from SMF configuration files #36

Job	Run time
build (docker_open5gs, base, Dockerfile)	4m 49s
build (docker_kamailio, ims_base, Dockerfile)	3m 50s
build (docker_srslte, srslte, Dockerfile)	15m 42s
build (docker_srsran, srsran, Dockerfile)	33m 0s
build (docker_ueransim, ueransim, Dockerfile)	4m 56s
build (docker_dns, dns, Dockerfile)	35s
build (docker_mysql, mysql, Dockerfile)	1m 7s
build (docker_pyhss, pyhss, Dockerfile)	2m 5s
build (docker_osmomsc, osmomsc, Dockerfile)	31s
build (docker_osmohlr, osmohlr, Dockerfile)	40s
build (docker_metrics, metrics, Dockerfile)	57s
build (docker_rtpengine, rtpengine, Dockerfile)	4m 11s
build (docker_oai_enb, oai, enb_dockerfile)	27m 13s
build (docker_oai_gnb, oai, gnb_dockerfile)	26m 12s
	2h 5m 48s

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