'get current configuration'

def get_current_config(self):

    flags = list()
    exp = '    |    ignore-case    section    include    dfs-group'
    if self.vpn_instance:
        exp += ('|^ip    vpn-instance    %s$' % self.vpn_instance)
    if self.vbdif_name:
        exp += ('|^interface    %s$' % self.vbdif_name)
    flags.append(exp)
    return get_config(self.module, flags)
