Description of problem:

Observing issues creating/managing System Templates in Katello when the same 
name is used for repositories across multiple products.

The implementation for the UI is using repo name; however, it needs to be updated to use ID (which is unique).

Version-Release number of selected component (if applicable):
git master

How reproducible:
always

Steps to Reproduce:
1. create provider
2. create product 1 (e.g. custom1), repo A (e.g. repo1)
3. create product 2 (e.g. custom2), repo A (e.g. repo1)
4. create a system template, add 1 instance of repo1 to it (from either product) and save it
5. download/export the TDL
 
Actual results:

the exported TDL contains both repos... for example:

<repositories>
<repository name="repo1">
<url>
https://localhost/pulp/repos/ACME_Corporation/Library/custom/custom1/repo1
</url>
<persisted>No</persisted>
</repository>
<repository name="repo1">
<url>
https://localhost/pulp/repos/ACME_Corporation/Library/custom/custom2/repo1
</url>
<persisted>No</persisted>
</repository>
</repositories>

Expected results:

Since the user selected only 1 repo, there should only be 1 associated with and this should be reflected in the exported TDL as well.

Additional info: