Add fsctl command to summon reincarnation

If you start freeswitch with -reincarnate or -reincarnate-reexec, FS
will restart automatically in the event of an unexpected exit.

Currently, you can cause FS to immediately call exit(0) with `fsctl
shutdown now`, or you can have it call abort() with `fsctl crash`.
Which are both nice, but if you have reincarnation engaged, you really
might want FS to call exit([non-zero]) so the great supervisor
immediately breathes life back into your system.

This is now available via `fsctl shutdown reincarnate now`.

src/include/switch_types.h

@@ -1861,6 +1861,7 @@ typedef enum {
 	SCSC_DEBUG_LEVEL,
 	SCSC_FLUSH_DB_HANDLES,
 	SCSC_SHUTDOWN_NOW,
+	SCSC_REINCARNATE_NOW,
 	SCSC_CALIBRATE_CLOCK,
 	SCSC_SAVE_HISTORY,
 	SCSC_CRASH,