Fixed display of request delete button
Fixed display of request delete button

- Fixed to show Request delete button if user has access to request delete feature.
- Added changes to show request delete button admin users all the time
- Show delete button but disable it if logged in user is not a submitter of the request with appropriate hover over text. Show delete button but disable it for non-admin user if request has already been approved or denied, with appropriate hover text.
- Changed get_record_cls method to determine class for different types of Requests.

https://bugzilla.redhat.com/show_bug.cgi?id=1227811
(transferred from ManageIQ/manageiq@d5fce031bf6ddfc53cd93f4a92ef3e195c90130a)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic