'Return True if the tags object from a VM contains the requested tag values.
:param tag_obj:  Dictionary of string:string pairs
:param tag_args: List of strings in the form key=value
:return: boolean'

def _tags_match(self, tag_obj, tag_args):

    if (not tag_obj):
        return False
    matches = 0
    for arg in tag_args:
        arg_key = arg
        arg_value = None
        if re.search(':', arg):
            (arg_key, arg_value) = arg.split(':')
        if (arg_value and (tag_obj.get(arg_key, None) == arg_value)):
            matches += 1
        elif ((not arg_value) and (tag_obj.get(arg_key, None) is not None)):
            matches += 1
    if (matches == len(tag_args)):
        return True
    return False
