* Add default license header to files which have no copyright or license header yet.
* yml extension should have been xml...
(cherry picked from commit 1ab2a5f1bc)
* add a new module iso_create
* add elements in argument spec
* remove changelog for new module
* change the path of test file
* comment out pip check task in test case
* comment out install pip in test case
* move pip install task and add skip python2.6