Jenkins cannot handle ${} vars in GitHub project

Jenkins cannot handle ${} vars in GitHub project

The GitHub project requires a rendered URL to the project. It does not
apparently properly render variables that are {} enclosed which means
that any vars needs to fully path separated properly

Issue: RELENG-188
Change-Id: Ie616752899453a0e614f1b6500eb2886e796d7a9
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>