Fix errors with regex espression

Update tests for the new bin behaviour

Update pg-upgrade with the correct dir information for the move to the
major dir

Add tests for the pg_version library

Stub out the running db version in the db tests

Fix rubocop error

Symlink in the old postgres install directory in order to keep upgrade
working

Use relative symlink in order to survive packaging process

Move the old postgres dir symlink into postinst

Use the proper directory test for symlink creation

Avoid automatic restarts of the postgres runit service

Update the geo-postgres spec with some missing PGVersion syntax

Fix duplicate method running_version

In base_pg_helper

A previous merge conflict must have been resolved incorrectly

Remove extra pgversion work that is no longer needed in this branch

Stick with the old postgres version for now, we will bump the verison in
a new MR