[misc]update xwalkctl to pkgcmd

Impacted TCs num(approved): New 0, update 4, deleted 0
Unit test platform: [tizen]
UT result: Pass:4, Fail 0, block 0
Merge pull request #968 from linshen/shenlin/misc/updatexwalkctl

[misc]update xwalkctl to pkgcmd
[wrt][WEBQA-152] Fix packertool and manifest automation issue
Merge pull request #969 from kangxu/kangxu/WEBQA-152/fixIssue

[wrt][WEBQA-152] Fix packertool and manifest automation issue
[behavior] Get rid of packaging scripts in Shell

See issue #868 for details.
[cordova] Get rid of packaging scripts in Shell

See issue #868 for details.
[webapi] Get rid of packaging scripts in Shell

See issue #868 for details.