issue #1412 re-connecting to postgres when connection is lost

[cfreyfh]

Proposed changes

It fixes that the PostgreSQL connections where not re-connected once they are closed by the PostgreSQL server (e.q. restart of the server or network problems)

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[cfreyfh]

refering to issue #1412

[kzangeli]

You seem to have changed the indentation to 4 spaces.
I'd really prefer to have two spaces, as in the rest of the code base.

[cfreyfh]

I changed the indentation to 2 spaces.

[kzangeli]

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[cfreyfh]

I have read the CLA Document and I hereby sign the CLA

[kzangeli]

Thank You very much for contributing!