Make test-unit runnable without parallel

Signed-off-by: Yohei Ueda <yohei@jp.ibm.com>
Export envvars necessary for unit-test

Signed-off-by: Yohei Ueda <yohei@jp.ibm.com>
Merge pull request #8999 from yoheiueda/test-unit-without-parallel

Make test-unit runnable without parallel