[EagerAppCDS] enable classpath change by replacing given env var #370

Job	Run time
Prerequisites	2s
Linux x64	27m 44s
Linux aarch64(fastdebug)	5m 31s
Linux aarch64(release)	28m 0s
Linux x64 Test (jdk/test/:jdk_tier1)	32m 13s
Linux x64 Test (jdk/test/:dragonwell_jdk_features)	5m 27s
Linux x64 Test (hotspot/test/:hotspot_tier1)	36m 14s
Linux x64 Test (hotspot/test/:hotspot_jwarmup)	5m 4s
Linux x64 Test (hotspot/test/:hotspot_elastic_heap)	19m 1s
Linux x64 Test (hotspot/test/:hotspot_multi_tenant)	1m 32s
Linux aarch64 Test (jdk/test/:jdk_tier1)	38m 22s
Linux aarch64 Test (jdk/test/:dragonwell_jdk_features)	11m 31s
Linux aarch64 Test (hotspot/test/:hotspot_tier1)	39m 50s
Linux aarch64 Test (hotspot/test/:hotspot_jwarmup)	11m 1s
Linux aarch64 Test (hotspot/test/:hotspot_elastic_heap)	24m 29s
	4h 46m 1s

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