Remove DEL command from Redis transport to avoid race on startup, res… #230

Job	Run time
build (linux-amd64)	1m 20s
build (linux-x86)	1m 8s
build (linux-i386)	1m 8s
build (windows-x64)	2m 13s
build (windows-x86)	1m 47s
runtimes (testscript)	1m 5s
tools	1m 18s
test_e2e	47s
docker_push (simer)	24s
containers (modelc, linux-amd64)	48s
docker_push (testscript)	30s
publish (linux-amd64)	6s
containers (modelc-x86, linux-x86)	34s
publish (linux-x86)	12s
containers (simbus-sa, linux-amd64)	41s
publish (linux-i386)	10s
publish (windows-x64)	9s
publish (windows-x86)	10s
	14m 30s

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