Use apt_get_update after we setup UCA

It is possible some CI system are using an http_proxy. Use the helper
function to cover this use case.

Change-Id: Iee685147ca0244fc7de328a765f937602223de20
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/tools/fixup_stuff.sh b/tools/fixup_stuff.sh
index 6f680b8..f3ba702 100755
--- a/tools/fixup_stuff.sh
+++ b/tools/fixup_stuff.sh
@@ -91,7 +91,9 @@
         # Otherwise use upstream UCA
         sudo add-apt-repository -y cloud-archive:ocata
     fi
-    sudo apt-get update
+    # Force update our APT repos, since we added UCA above.
+    REPOS_UPDATED=False
+    apt_get_update
 fi