Adding topology overlay support for the server-side topo layout app.

Also:
- parametrized access network layout in preparation for multiple variants
- removed WS authentication code temporarily until proper forced-logout is implemented
- updated STC warden environment (test only)

Change-Id: I0adbe60737828db79350e7eb2fc72cf313b78a28
diff --git a/apps/layout/BUCK b/apps/layout/BUCK
index 87e21e3..5d249c4 100644
--- a/apps/layout/BUCK
+++ b/apps/layout/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:JACKSON',
     '//lib:org.apache.karaf.shell.console',
     '//core/common:onos-core-common',
     '//cli:onos-cli',