Sketching SB & NB API.
Modified onos-of-api pom to subsume openflowj loxi-generated stuff.
diff --git a/net/api/src/main/java/org/onlab/onos/provider/Provider.java b/net/api/src/main/java/org/onlab/onos/provider/Provider.java
new file mode 100644
index 0000000..8fb047f
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/provider/Provider.java
@@ -0,0 +1,10 @@
+package org.onlab.onos.provider;
+
+/**
+ * Abstraction of a provider of information about network environment.
+ */
+public interface Provider {
+
+ ProviderId id();
+
+}