pmrep: force floating point in timestamp calculation for py2
pmrep: force floating point in timestamp calculation for py2

Resolves some cases of qa/1068 failure Ken has come across.

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