updateserver - modified to check if config files have been updated by apt.

updateserver now backs up config files for services and does an md5sum check after then update has completed.
If the md5sums do not match the backup config file is restored and the service restarted.

This has been put in place to solve the problem that occured at DGSB where apt updated all servers and modified /etc/nslcd.conf even though it was supposed to keep original config files. The servers could not see any users and had to have nslcd.conf restored and nslcd restarted.