Use git-scripts in addition to plume-scripts #709

Job	Run time
build (cfi-tests, 8)	8m 40s
build (cfi-tests, 11)	10m 17s
build (cfi-tests, 17)	9m 50s
build (downstream-ontology, 8)	4m 17s
build (downstream-ontology, 11)	6m 58s
build (downstream-ontology, 17)	6m 6s
build (downstream-security-demo, 8)	4m 19s
build (downstream-security-demo, 11)	6m 17s
build (downstream-security-demo, 17)	5m 49s
build (downstream-universe, 8)	4m 10s
build (downstream-universe, 11)	5m 49s
build (downstream-universe, 17)	5m 53s
	1h 18m 25s

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