cgconfig.conf: parse template tag and fill relevant structures

cgconfig.conf: parse template tag and fill relevant structures

    cgconfig.conf: this patch add structures : MAX_TEMPLATES, config_template_table, config_template_table_index and the body of functions: template_config_insert_cgroup, template_config_parse_controller_options
    The structures stored the content of "template" tag from configuration file "cgconfig.conf". The structure have the same meaning as have structures for control groups tag.

    CHANGELOG:
        create enum instead of constants

    Signed-off-by: Ivana Hutarova Varekova <varekova@redhat.com>
    Acked-By: Jan Safranek <jsafrane@redhat.com>