Removes a group from the Postgres server.

    CLI Example:

    .. code-block:: bash

        salt '*' postgres.group_remove 'groupname'

def group_remove(groupname,
                 user=None,
                 host=None,
                 port=None,
                 maintenance_db=None,
                 password=None,
                 runas=None):
    '''
    Removes a group from the Postgres server.

    CLI Example:

    .. code-block:: bash

        salt '*' postgres.group_remove 'groupname'
    '''
    return _role_remove(groupname,
                        user=user,
                        host=host,
                        port=port,
                        maintenance_db=maintenance_db,
                        password=password,
                        runas=runas)