Added set_stable description output

Change-Id: If255572ad19364a6552d6a459acc35dbc476f8de
Added mirrors update description output

Change-Id: I412c66069dd1f2082433562b9d02395f4f2c3687
Added saving of build description to txt

Change-Id: Ibf99b481e3bcabf5bcf3837debb7a7ba9699b118