uint32 variable was overflowing so changing it to uint64
uint32 variable was overflowing so changing it to uint64

timeseries variable was defined as uint32 so values beyond 4B were
overflowing. So when range is beyond 70 mins, binning does not work properly.
Closes-Bug: #1627178

Change-Id: I2ecf6ffe39fc7f59133c75bc60ecc4634132d19a

eonpatapon/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller