[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/vendor/go.etcd.io/etcd/pkg/runtime/fds_other.go b/vendor/go.etcd.io/etcd/pkg/runtime/fds_other.go
new file mode 100644
index 0000000..0cbdb88
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/runtime/fds_other.go
@@ -0,0 +1,30 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !linux
+
+package runtime
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func FDLimit() (uint64, error) {
+	return 0, fmt.Errorf("cannot get FDLimit on %s", runtime.GOOS)
+}
+
+func FDUsage() (uint64, error) {
+	return 0, fmt.Errorf("cannot get FDUsage on %s", runtime.GOOS)
+}