Revert "Jenkins_slave connects to current hostname instead of fixed"

This reverts commit 4bd4e5eea61a51cca6bdaabbd77024d7079d0cf0.
Commit caused all CI's 10.8 nodes to go offline, while node couldn't
fetch the jnlp file.

Change-Id: Icd56fd36657cda52b1a551d244058f08c175eceb
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>