Enabling redundant failback timer

A new reason code, COORD_R_LOST2, for mutually-aware environments allows a failback timer to be installed in custom coordination modules that do not handle any server failure action. The timer uses the cm_is_active coordination module routine to handle the failback.

See “Enabling redundant failback timer,” in Chapter 2, “Using Coordination Modules” in the OpenSwitch Coordination Module Reference Manual for more information on COORD_R_LOST2.