cubicweb #710931 same usage for dump/restore [rejected]

Use same usage for dump/restore instead of different options

Usage: cubicweb-ctl db-dump <instance> -o <file>
Usage: cubicweb-ctl db-restore <instance> <backupfile>
priorityminor
typeenhancement
done in<not specified>
load0.000
load left0.000
closed by<not specified>