Ruby Time objects seem to only be able to be created in 2 timezones - UTC or local time zone.

When running in a timezone that is not "Eastern Time (US & Canada)", such as Pacific Time,
need to convert all time objects to UTC for proper comparison.
Merge pull request #152 from chessbyte/fix_miq_expression_spec_in_non_eastern_timezone

Fix MiqExpressionSpec to work in Timezone != "Eastern Time (US & Canada)"