[HBCK2] Add useful messages when report/fixing missing regions in meta

When a table name is wrongly passed without the namespace portion, reportMissingRegionsInMeta just reports:

Missing Regions for each table:

similarly, addFsRegionsMissingInMeta just reports:

Regions re-added into Meta: 0

Let' make it more friendly by letting the user know that the table name is wrongly passed while it's mentioned in the command usage.