Run dep init to migrate from glide

* This does not include the code generators, such as gogen, because of
an open issue in dep: golang/dep#1306.
* This adds a new dependency that was not previously identified with
glide: github.com/petar/GOLLRB

Gopkg.toml

@@ -0,0 +1,37 @@
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+
+[[constraint]]
+  name = "github.com/coreos/etcd"
+  version = "3.2.9"
+
+[[constraint]]
+  name = "k8s.io/api"
+  version = "kubernetes-1.8.0"
+
+[[constraint]]
+  name = "k8s.io/apimachinery"
+  version = "kubernetes-1.8.0-rc.1"
+
+[[constraint]]
+  name = "k8s.io/apiserver"
+  version = "kubernetes-1.8.0-rc.1"