Time zones do not work correctly in continuous queries

[jsternberg]

Bug report

System info: InfluxDB 1.3

Steps to reproduce:

1. Create a continuous query using a time zone with GROUP BY time(1d)

Expected behavior: The time zone should influence when the CQ gets run so you get the data in the correct time zone.

Actual behavior: It sets the start and end time to be a day in UTC, but the query still properly accounts for the time zone so it only selects part of the day.

Additionally, the start and end time should accomodate when the time zone changes the same way that the query engine does.

[jsternberg]

This is similar to #8569. The symptoms are the same even if the reason is different.

[jsternberg]

Fixed via #8606.