[VOL-2831] - Multiple adapter support

This commit introduces the necessary APIs needed to support
multiple adapters.  It uses the number of replicas of a given
adapter and consistent hashing to determine the target of a
given request.

The endpoint_manager.go provides two APIs that will be needed
by components communicating over kafka:
 - GetEndPoint() : to be called before sending a request to kafka
 - IsDeviceOwnedByService(): used during device reconciliation

A change is made to the adapter_proxy.go to use this new mechanism
when sending a request to an adapter from another adapter.

The mocks directory was refactored to get around circular package
dependencies.  This implies any component using these mocks will
need to adjust to the new set of directories when using this
library version.

Change-Id: I470cd62fcfd04edc1fd4508400c9619cadaab25a
diff --git a/vendor/github.com/buraksezer/consistent/LICENSE b/vendor/github.com/buraksezer/consistent/LICENSE
new file mode 100644
index 0000000..e470334
--- /dev/null
+++ b/vendor/github.com/buraksezer/consistent/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Burak Sezer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.