pglookout: Fix timestamp parsing to work better, fix test broken by this
pglookout: Fix timestamp parsing to work better, fix test broken by this

Now that it was correctly parsing the timestamp, a test failed,
now always trust ourselves the most only when we're actually connected
to the other slave and have a newer state than the observer does.

ohmu/pglookout,saaros/pglookout,Ormod/pglookout,Ormod/pglookout