add -f or --force to overcome the setup's 'no' option #293

Job	Run time
ucvm-build-cvmh-taper (3.7)	59m 54s
ucvm-build-cvms-cvmh (3.7)	49m 25s
ucvm-build-albacore-cvlsu-ivlsu-wfcvm (3.7)	35m 0s
	2h 24m 19s

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