[INTERNAL] removed watchdog check from SharedResourcesManager

This check does nothing. The reason is simple. The checksum activity
that is needed to perform the check is:

1. still in the execution queue
2. upon executing the checksum activity the perform check method is
triggered automatically

Change-Id: Idc5436a24a00ec46cfb6662e939b2412ada7e88e
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1856
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>