Check backup integrity by listing the tar file

Throw InvalidData exception if the tar is corrupted
Send the checksum of the conf backup when pushing

To check its integrity on server side
Retrying when a corruption is found in conf backup

Retry making the automatic configuration backup if the conf backup process
produced a corrupted backup
Merge branch 'ejhernandez/check-backup-integrity' into 3.0

Conflicts:
	main/remoteservices/ChangeLog