ONOS-4801 add default available field to gRPC model

- replace deprecated methods with new Protobuf 3 API
- cosmetic changes

Change-Id: I4655fc0fd76c8de83ea03615fc876c5aa9445367
diff --git a/incubator/protobuf/src/main/proto/Device.proto b/incubator/protobuf/src/main/proto/Device.proto
index a01790e..75cf0f5 100644
--- a/incubator/protobuf/src/main/proto/Device.proto
+++ b/incubator/protobuf/src/main/proto/Device.proto
@@ -12,6 +12,7 @@
   string serial_number = 6;
   string chassis_id = 7;
   map<string, string> annotations = 8;
+  bool is_default_available = 9;
 }
 
 enum MastershipRole {
@@ -47,4 +48,4 @@
   string serial_number = 6;
   string chassis_id = 7;
   map<string, string> annotations = 8;
-} 
\ No newline at end of file
+}
diff --git a/incubator/protobuf/src/main/proto/DeviceEvent.proto b/incubator/protobuf/src/main/proto/DeviceEvent.proto
index 9bf7a2f..6a88768 100644
--- a/incubator/protobuf/src/main/proto/DeviceEvent.proto
+++ b/incubator/protobuf/src/main/proto/DeviceEvent.proto
@@ -26,5 +26,3 @@
     PORT_STATS_UPDATED = 8;
 }
 
-
-
diff --git a/incubator/protobuf/src/main/proto/Link.proto b/incubator/protobuf/src/main/proto/Link.proto
index b5fcbfc..a1ae8ff 100644
--- a/incubator/protobuf/src/main/proto/Link.proto
+++ b/incubator/protobuf/src/main/proto/Link.proto
@@ -8,7 +8,7 @@
   DIRECT = 0;
 
   // Signifies that this link is potentially comprised from multiple
-  //underlying segments or hops, and as such should be used to tag
+  // underlying segments or hops, and as such should be used to tag
   // links traversing optical paths, tunnels or intervening 'dark'
   // switches.
   INDIRECT = 1;