Fix to not encode user input in forms before sending up to server.

Fixed an issue introduced in https://github.com/ManageIQ/manageiq/issues/1150 PR, encoding of URL for forms was causing an issue if user entered empty space or other characters in the form fields. Added a setting to be passed in to miqJqueryRequest method when url does not need to be encoded.
Merge pull request #1281 from h-kataria/fix_for_url_encoding

Fix to not encode user input in forms before sending up to server.