Ensure a sensible timeout for pgsql commands

[edevil]

The psql command has no default timeout, so if the server is not
responding or if some lock cannot be obtained, we will be waiting
forever.

What does this PR do?

Introduce a default timeout of 60s for all psql commands.

Previous Behavior

Module would wait forever for commands to return.

New Behavior

Module will wait at most 60s for psql command to complete.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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[dmurphy18]

Can this be made configurable with the default being 60 secs.
There should also be tests to check that the value is operational

Also needs a changelog entry (one liner describing the fix)

[MKLeb]

@edevil Have you been able to look at implementing @dmurphy18 's suggestion?

[edevil]

Hey @MKLeb. Sorry but no, I've been a bit busy.

[twangboy]

This needs a test and a changelog

[welcome]

Congratulations on your first PR being merged! 🎉