Added support to prompt for support case for RH Dropbox log collection

- Changes to prompt with JS pop up box for support case when file_log_depot type is "FileDepotFtpAnonymousRedhatDropbox".
- Changed logs_collect method to pass support_case in options that is being store in args column of miq_queue table.

https://bugzilla.redhat.com/show_bug.cgi?id=965889

@brandondunne @dclarizio please review/test.
Well yes, you should generally escape anything that goes into the URL -- http://www.w3schools.com/jsref/jsref_encodeuricomponent.asp -- or the user can put ```&,;,#``` whatever in and break the expected behavior.
Then there's a space missing on line 223 after the coma.
Then it would be nice to use just ```'``` or ```"``` and not to mix both in a single piece of code.
So generally, there's some room for improvement in the PR.
Maybe we should search for some equivalent of Rubocop for Javascript code ;-)