Use git-scripts in addition to plume-scripts #710

Job	Run time
build (cfi-tests, 8)	8m 16s
build (cfi-tests, 11)	10m 9s
build (cfi-tests, 17)	10m 39s
build (downstream-ontology, 8)	8m 22s
build (downstream-ontology, 11)	10m 19s
build (downstream-ontology, 17)	10m 13s
build (downstream-security-demo, 8)	8m 7s
build (downstream-security-demo, 11)	9m 50s
build (downstream-security-demo, 17)	9m 58s
build (downstream-universe, 8)	5m 31s
build (downstream-universe, 11)	7m 18s
build (downstream-universe, 17)	7m 22s
	1h 46m 4s

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