add check on global env setting for default install dir #280

Job	Run time
ucvm-build-cvmh-taper (3.7)	26m 27s
ucvm-build-cvms-cvmh (3.7)	28m 23s
ucvm-build-albacore-cvlsu-ivlsu-wfcvm (3.7)	27m 0s
	1h 21m 50s

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