zhaoxinyu 720fcbecd0 Change input to string and convert to list later
Because virtual env is set as string, need to convert to list
Such env as ROLES_LIST, MACHINES_TO_ADD

Change-Id: I13a32b3d92908e1b4f811fdd5d9f143d5a4050ac
2014-03-14 23:41:57 +00:00
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