Bionic: Enable Train UCA for updated QEMU and libvirt

This is will allow the openstack/nova project to facilitate a minimum
required version bump of QEMU and libvirt within the libvirt virt driver
in I8e349849db0b1a540d295c903f1470917b82fd97 ahead of the planned switch
to focal later in Victoria.

Change-Id: I85eb45632ff229676f7c29708f4a7cc64b3d90e3

tools/fixup_stuff.sh

@@ -73,6 +73,18 @@ function fixup_ubuntu {
     # Enable universe
     sudo add-apt-repository -y universe
 
+    if [[ -f /etc/ci/mirror_info.sh ]] ; then
+        # If we are on a nodepool provided host and it has told us about
+        # where we can find local mirrors then use that mirror.
+        source /etc/ci/mirror_info.sh
+        sudo apt-add-repository -y "deb $NODEPOOL_UCA_MIRROR bionic-updates/train main"
+    else
+        # Enable UCA:train for updated versions of QEMU and libvirt
+        sudo add-apt-repository -y cloud-archive:train
+    fi
+    REPOS_UPDATED=False
+    apt_get_update
+
     # Since pip10, pip will refuse to uninstall files from packages
     # that were created with distutils (rather than more modern
     # setuptools).  This is because it technically doesn't have a