Name and description are always copied from template
Name and description are always copied from template

  * The device template name and description are always being copied
    from the template definition YAML and overwriting the values
    specified by the user on the command line or in the GUI

  * The create_device_template_pre() method was modified to only
    copy the values from the template when they do not already
    exist in the device_template dictionary that is passed in.

Change-Id: I3df900e017a859875c563ef13a9b5824a634efa3
Closes-Bug: 1475774

stackforge/tacker,trozet/tacker,trozet/tacker,openstack/tacker,priya-pp/Tacker,stackforge/tacker,openstack/tacker,priya-pp/Tacker,zeinsteinz/tacker,openstack/tacker,zeinsteinz/tacker