buildinfohelper: ensure task datetimes are timezone-aware
When using toaster-eventreplay to run a bitbake event file
through toasterui/buildinfohelper, errors occur when the
tasks are updated with buildstats info:
RuntimeWarning: DateTimeField Task.started received a naive
datetime (2016-07-06 09:15:22.070000) while time zone support
is active.
This is because a method in buildinfohelper returns a naive
datetime, but Django is expecting timezone-aware datetimes.
Ensure that datetimes used to set the started/ended times on
tasks are converted to timezone-aware datetimes.
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>