[VOL-1442]  This commit handles adapter registration end to end.
It introduces an adapter manager to handle all adapter admin
requests.  Some protos have been cleaned as well.

Change-Id: If75d4f7665c03e841d57f5621c30301940d04d93
diff --git a/protos/adapter.proto b/protos/adapter.proto
index fc1ec94..c70e0a6 100644
--- a/protos/adapter.proto
+++ b/protos/adapter.proto
@@ -22,7 +22,7 @@
 // Adapter (software plugin)
 message Adapter {
 
-    // Unique name of adapter, matching the python packate name under
+    // Unique name of adapter, matching the python package name under
     // voltha/adapters.
     string id = 1 [(access) = READ_ONLY];
     string vendor = 2 [(access) = READ_ONLY];
@@ -34,8 +34,6 @@
     // Custom descriptors and custom configuration
     google.protobuf.Any additional_description = 64 [(access) = READ_ONLY];
 
-    repeated string logical_device_ids = 4;  // Logical devices "owned"
-
 }
 
 message Adapters {