Implement bazel support for web context

- add web context to OSGI rules
- build ACL app
- build DHCP app

Change-Id: I03687d109eb44621458ad7269a435e03eec47495
diff --git a/apps/dhcp/api/BUILD b/apps/dhcp/api/BUILD
new file mode 100644
index 0000000..f72e3bc
--- /dev/null
+++ b/apps/dhcp/api/BUILD
@@ -0,0 +1,3 @@
+osgi_jar_with_tests(
+    deps = CORE_DEPS,
+)