Description of problem:

The WebUI does not currently allow users to perform repo discovery using file URLs.

Version-Release number of selected component (if applicable):
katello-1.4.6-61.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. go to Content->Repositories->Products
2. click Repo Discovery
3. enter a file resource URL (e.g. file:///var/www/html/repos)

Actual results:
The Discover button is disabled

Expected results:
The Discover button is enabled

Additional info:

As a workaround, it is possible to accomplish repo discovery using the CLI.

Pre-requisite, the product used in the CLI should exist prior to discovery:

For example:

$ katello --username admin --password [password] shell

katello> repo discover --org ACME_Corporation --name my_repo_prefix --url=file:///var/www/repos --product zoo
Discovering repository urls, this could take some time...
(-)  [1] file:///var/www/repos/zoo1
(-)  [2] file:///var/www/repos/zoo2
(-)  [3] file:///var/www/repos/zoo3

Select urls for which candidate repos should be created; use `y` to confirm (h for help):1
(+)  [1] file:///var/www/repos/zoo1
(-)  [2] file:///var/www/repos/zoo2
(-)  [3] file:///var/www/repos/zoo3

Select urls for which candidate repos should be created; use `y` to confirm (h for help):2
(+)  [1] file:///var/www/repos/zoo1
(+)  [2] file:///var/www/repos/zoo2
(-)  [3] file:///var/www/repos/zoo3

Select urls for which candidate repos should be created; use `y` to confirm (h for help):3
(+)  [1] file:///var/www/repos/zoo1
(+)  [2] file:///var/www/repos/zoo2
(+)  [3] file:///var/www/repos/zoo3

Select urls for which candidate repos should be created; use `y` to confirm (h for help):y
Successfully created repository [ my_repo_prefix_var_www_repos_zoo1 ]
Successfully created repository [ my_repo_prefix_var_www_repos_zoo2 ]
Successfully created repository [ my_repo_prefix_var_www_repos_zoo3 ]
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