postgresql: generate postgresql.conf file instead of using start arguments.
postgresql: generate postgresql.conf file instead of using start arguments.

Instead of overriding options using postgresql -c argument, just generate the
postgresql.conf file.

The base file created by initdb is renamed and included at the start of the
generated postgresql.conf.

Additionally the config file are firstly created as temporary file, then
atomically moved.

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