Break up fixup_stuff

Neutron functional tests want to use ubuntu cloud archive but it's
not possible to source the fixup_stuff.sh from a neutron CI setup
script. Break it up so that only the UCA portion can be executed
from neutron.

Change-Id: Ie18833bfa30f1789e63cbe9c86f5ece3453f43fb
diff --git a/stack.sh b/stack.sh
index 9b496c0..81d2ed2 100755
--- a/stack.sh
+++ b/stack.sh
@@ -773,6 +773,7 @@
 
 # Do the ugly hacks for broken packages and distros
 source $TOP_DIR/tools/fixup_stuff.sh
+fixup_all
 
 if [[ "$USE_SYSTEMD" == "True" ]]; then
     pip_install_gr systemd-python