pmdapostgresql: more pylint fixes
pmdapostgresql: more pylint fixes

now get around 9.54/10 mostly due to some remaining TODO's

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp