Remove install-distro step for nodepool integration

The nodepool zuul integration test now runs bindep with proper parameter
so that this step is not needed, remove it.

Change-Id: Ie449aa2b7c5c46c33dd670f07b01262383d0528b
Depends-On: https://review.openstack.org/545158
diff --git a/tools/nodepool-integration-setup.sh b/tools/nodepool-integration-setup.sh
index 67d766d..3180ed6 100755
--- a/tools/nodepool-integration-setup.sh
+++ b/tools/nodepool-integration-setup.sh
@@ -6,7 +6,6 @@
 ln -s /tmp/nodepool/log $HOME/logs
 
 cd /tmp/openstack-infra/nodepool
-/usr/local/jenkins/slave_scripts/install-distro-packages.sh
 sudo pip3 install .
 
 bash -xe ./tools/zuul-nodepool-integration/start.sh