VOL-1558 Implementation of openolt adapter with dep for dependency management
Also updated the build system to take this into account.

Currently dep ensure fails due to missing libraries in voltha-go, but the vendor folder has been updated otherwise.
This can be worked around in development using the LOCAL_VOLTHAGO variable described in the readme
This does not build currrently, but that is due to missing code in voltha-go master.

This pattern is consistent with how voltha-go does things, but does not leave you dependent on it to build.

See the readme for how to use dep.

The resourcemanager file is no longer hidden.

Change-Id: I25b8472dbc517b193970597c9f43ddff18c2d89f
diff --git a/adaptercore/device_handler.go b/adaptercore/device_handler.go
index b626242..1c2fdf9 100644
--- a/adaptercore/device_handler.go
+++ b/adaptercore/device_handler.go
@@ -33,7 +33,7 @@
 	ic "github.com/opencord/voltha-protos/go/inter_container"
 	of "github.com/opencord/voltha-protos/go/openflow_13"
 	oop "github.com/opencord/voltha-protos/go/openolt"
-        rsrcMgr "github.com/opencord/voltha-go/adapters/openolt/adaptercore/resourcemanager"
+	rsrcMgr "github.com/opencord/voltha-openolt-adapter/adaptercore/resourcemanager"
 	"github.com/opencord/voltha-protos/go/voltha"
 	"google.golang.org/grpc"
 )