Handled miq_request case separately to differentiate 2 kinds of URLs

Handled the miq_request case separately to differentiate 2 kinds of URLs
(a) /miq_request?typ=vm   --- Used for Services/Requests tab
(b) /miq_request?typ=host --- Used for Infrastructure/Requests tab

This resolved the issue of user getting redirected to the incorrect
Requests page when the main tab - Services or Infrastructure is clicked.

https://bugzilla.redhat.com/show_bug.cgi?id=1136363
Merge pull request #493 from AparnaKarve/bz1136363_distinguish_miq_request_url_for_vm_and_host

Main tab URLs that get redirected to a Requests page should take into account the value of request paramter - 'typ' for proper redirection