get 'test_case' option form environment variable 59/55559/1
authordongwenjuan <dong.wenjuan@zte.com.cn>
Thu, 12 Apr 2018 09:06:28 +0000 (17:06 +0800)
committerdongwenjuan <dong.wenjuan@zte.com.cn>
Thu, 12 Apr 2018 09:06:28 +0000 (17:06 +0800)
Get 'test_case' option form environment variable. If no
environment variable, use the default value so that we can
specify the test case in doctor verify job.

Change-Id: I1bc25d024ca56637d779006d685b57254af355a5
Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

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