Fixes for problems with starting and stopping apps in a minimal system

- Missing app dependencies
- Incorrect provider registrations
- Fatal execeptions thrown when external resources are not present

Change-Id: I3fdcf0666c88a47f399a722a9ab549d1104ff40e
diff --git a/providers/bgp/BUILD b/providers/bgp/BUILD
index b996b79..b47739a 100644
--- a/providers/bgp/BUILD
+++ b/providers/bgp/BUILD
@@ -12,7 +12,11 @@
     category = "Provider",
     description = "BGP protocol southbound providers.",
     included_bundles = BUNDLES,
-    required_apps = ["org.onosproject.evpn-route-service"],
+    required_apps = [
+        "org.onosproject.evpn-route-service",
+        "org.onosproject.tunnel",
+        "org.onosproject.pcep-api",
+    ],
     title = "BGP Provider",
     url = "http://onosproject.org",
 )