UBUNTU: [Debian] Set +x on rebuild testcase.

BugLink: https://bugs.launchpad.net/bugs/1823056Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>