Fix deprecation warning to not execute code

The warning about lftools-install script being deprecated was quoted
incorrectly, so the `code` it suggested was actually executed. This
caused this script to fail, resulting in builds being marked unstable
and logs failing to deploy.

Change-Id: I394baf37a1a82d54fdbee62010af5be0be5527ff
Signed-off-by: Daniel Farrell <dfarrell@redhat.com>