* fixed pep8 issue from previous fix
* removed str casting in xml element setting
  for _set_xml_etree_element function

Change-Id: I2a80b1782a084d9a2339055b199fd2cac3681844
Removes deprecated bad xml tools mixin from base model

Change-Id: I9a172f93d320ec2e3a28d64d789429215efb98ac
Merge "Removes deprecated bad xml tools mixin from base model"
Merge "* fixed pep8 issue from previous fix * removed str casting in xml element setting   for _set_xml_etree_element function"