[wrt]update packertool to supprt env devices

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 2, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 2, Fail 0, Blocked 0
Merge pull request #787 from linshen/wrt/change-host-mutil

[wrt]update packertool to supprt env devices