Revert "AMBARI-3346. Fix repo url parametrization under Ubuntu (dlysnichenko)"

This reverts commit f53d5a3de6c40a9e57b686cea8ca23b9f76f60d5.
Revert "AMBARI-3302. Parameterize the repo url for latest stack."

This reverts commit 761ffed40c7fe05b1d7c7cd239706bc79d12394b.