Fix for bug 6991, replace registrars timer tick

Registrar schedules an event every second to do
fRoster-CheckSanity(). This uses 2.5% cpu on my machine
when idle. Changing it to five seconds lowers it to 0.1%

waddlesplash then pointed me to this bug which changes it
to watch for team deletion and call fRoster->CheckSanity()

As I know little in this area, it's mostly based on what
LaunchDaemon does in MessageRecieved.

Change-Id: Ie69f9399cab41d2d492d469b5d3dc88e6080c15c
Reviewed-on: https://review.haiku-os.org/c/876
Reviewed-by: waddlesplash <[email protected]>

headers/private/app/RegistrarDefs.h

@@ -96,7 +96,6 @@ enum {
 	B_REG_GET_MESSAGE_RUNNER_INFO			= 'rgri',
 
 	// internal registrar messages
-	B_REG_ROSTER_SANITY_EVENT				= 'rgir',
 	B_REG_SHUTDOWN_FINISHED					= 'rgsf',
 	B_REG_ROSTER_DEVICE_RESCAN				= 'rgrs',