Postgres: remove datadir on initialization error
Postgres: remove datadir on initialization error

Remove the datadir if there's an error during database initialization.
So we don't have an unmanagable half initialized database.

siepkes/stolon,sorintlab/stolon,sorintlab/stolon,smkingsoft/stolon,siepkes/stolon,smkingsoft/stolon,sgotti/stolon,sgotti/stolon