rpc rewrite: control RPCs using gRPC + separate RPC for data transfer

transport/ssh: update go-netssh to new version
    => supports CloseWrite and Deadlines
    => build: require Go 1.11 (netssh requires it)

Gopkg.toml

@@ -1,14 +1,12 @@
-ignored = [ "github.com/inconshreveable/mousetrap" ]
+ignored = [
+    "github.com/inconshreveable/mousetrap",
+]
 
 required = [
     "golang.org/x/tools/cmd/stringer",
     "github.com/alvaroloes/enumer",
 ]
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/ftrvxmtrx/fd"
-
 [[constraint]]
   branch = "master"
   name = "github.com/jinzhu/copier"
@@ -17,14 +15,6 @@ required = [
   branch = "master"
   name = "github.com/kr/pretty"
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/mitchellh/go-homedir"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/mitchellh/mapstructure"
-
 [[constraint]]
   name = "github.com/pkg/errors"
   version = "0.8.0"
@@ -33,10 +23,6 @@ required = [
   branch = "master"
   name = "github.com/spf13/cobra"
 
-[[constraint]]
-  name = "github.com/spf13/viper"
-  version = "1.0.0"
-
 [[constraint]]
   name = "github.com/stretchr/testify"
   version = "1.1.4"
@@ -49,10 +35,6 @@ required = [
   name = "github.com/go-logfmt/logfmt"
   version = "*"
 
-[[constraint]]
-  name = "github.com/problame/go-rwccmd"
-  branch = "master"
-
 [[constraint]]
   name = "github.com/problame/go-netssh"
   branch = "master"
@@ -63,18 +45,17 @@ required = [
 
 [[constraint]]
   name = "github.com/golang/protobuf"
-  version = "1.2.0"
+  version = "1"
 
 [[constraint]]
   name = "github.com/fatih/color"
   version = "1.7.0"
 
-[[constraint]]
-  name = "github.com/problame/go-streamrpc"
-  version = "0.5.0"
-
-
 
 [[constraint]]
   name = "github.com/gdamore/tcell"
   version = "1.0.0"
+
+[[constraint]]
+  name = "google.golang.org/grpc"
+  version = "1"