Made changes to instance add/edit code to remove AR Objects from @edit

- Changed code to add/edit Instance to not store AR Objects in @edit instead store required fields into array of hashes. Made some minor cleanup along the way to methods edited in this commit.
- Changed view to use hashes to access data instead of AR Object.

https://bugzilla.redhat.com/show_bug.cgi?id=1114747
https://bugzilla.redhat.com/show_bug.cgi?id=1115652
Made suggested changes from PR review.

Removed code duplication from initial_setup_for_instances_form_vars method.

https://bugzilla.redhat.com/show_bug.cgi?id=1114747
https://bugzilla.redhat.com/show_bug.cgi?id=1115652
Remove @record from session and move grid xml from @edit to @temp

https://bugzilla.redhat.com/show_bug.cgi?id=1114747
https://bugzilla.redhat.com/show_bug.cgi?id=1115652
Changed to only save/update instance field if it's not nil.

Added a missing header column "On Error" in Instance grid, that was causing grid to display incorrect data in rows.

https://bugzilla.redhat.com/show_bug.cgi?id=1114747
https://bugzilla.redhat.com/show_bug.cgi?id=1115652
Fix broken specs triggered by changes to Daylight Savings Time
Merge pull request #150 from chessbyte/fix_broken_schedule_worker_spec_for_dst

Fix broken ScheduleWorker spec triggered by changes to Daylight Savings Time
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.
Fix routing issues for automate reset on import/export screen.
Merge pull request #152 from chessbyte/fix_miq_expression_spec_in_non_eastern_timezone

Fix MiqExpressionSpec to work in Timezone != "Eastern Time (US & Canada)"
Merge pull request #154 from gmcculloug/automate_reset_from_ui

Fix routing issues for automate reset on import/export screen.
Merge pull request #139 from h-kataria/removed_ar_objects_from_ae_instance_editor

Made changes to instance add/edit code to remove AR Objects from @edit