db: mongo: timezone-aware connection
db: mongo: timezone-aware connection

Connect to mongodb in timezone aware mode.

This enables all timestamps to include timezone information, which is
now required by kcidb schema.

Signed-off-by: Kevin Hilman <f9849b02abe18c1ece6bd40346458ed53f49d31b@baylibre.com>

kernelci/kernelci-backend,kernelci/kernelci-backend