Description of problem:

On changing git url in form editor the change is not reflected in the yaml as the annotation

`app.openshift.io/vcs-uri` value is not updated with the new URL. 

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Open Edit BuildConfig form.
2. Update git url.
3. Open yaml editor.

Actual results:

Notice that `app.openshift.io/vcs-uri` is not updated with the new URL.

See attachment.

Expected results:

`app.openshift.io/vcs-uri` should be updated with the new URL and any other annotations/labels that depends on values that can be updated via the form editor should be updated accordingly.

Reproducibility (Always/Intermittent/Only Once): Always

Always

Build Details:

4.9 master (tested with 5a03b49462d0f3b1b35409814ae722f96c753cf3)

Additional info:

None