Strip Superfluous Spaces from Metadata URL Field

JJ, I'm assigning this to you to determine if this should be a front-end or back-end task. This was one of the issues we discussed during Friday's meeting.

Tested in version 1.0.1-SNAPSHOT-4804797
Description
When a valid Metadata URL is entered but there's a trailing space upon saving the provider the user is stuck with the loading upon save. If the user logs out and back in again, the provider appears on the provider list. However, if the user attempts to edit the provider or add a filter, they are again presented with the save issue.
 
Steps
Create Flow # Log into UI

1. Click 'Add New' button and select 'Metadata Provider’
2. Enter a valid Metadata URL with a trailing space: "https://idp.unicon.net/idp/shibboleth "
3. Move through the application to the Save page

 
Edit Flow # From Dashboard, select Metadata Providers tag

1. Make any edit EXCEPT for the Metadata URL which still has a trailing space: "https://idp.unicon.net/idp/shibboleth "
2. Save page

 
What is occurring
Perpetual loading.
 
What is expected
Two possible solutions:
1. UI can strip the space(s)
2. Back end can strip the space(s)
 
Error Code
Failed to load resource: the server responded with a status of 400 ()