Add keepalived, conntrackd as dependencies

Neutron L3 HA blueprint l3-high-availability requires
keepalived and conntrackd in order to work for developers as
well as for functional tests.

Change-Id: Ic32d913c2bc6fae339b4d5ec509a77df5a21de72
diff --git a/files/apts/q-l3 b/files/apts/q-l3
new file mode 100644
index 0000000..b98b628
--- /dev/null
+++ b/files/apts/q-l3
@@ -0,0 +1,2 @@
+conntrackd
+keepalived