Move namespaces into linux spec

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

README.md

@@ -48,7 +48,7 @@ user named `daemon` defined within that file-system.
         "arch": "amd64"
     },
     "process": {
-        "tty": true,
+        "terminal": true,
         "user": "daemon",
         "args": [
             "sh"

spec.go

@@ -18,7 +18,7 @@ type Mount struct {
 }
 
 type Process struct {
-	Terminal bool     `json:"tty"`
+	Terminal bool     `json:"terminal"`
 	User     string   `json:"user"`
 	Args     []string `json:"args"`
 	Env      []string `json:"env"`
@@ -30,11 +30,6 @@ type Root struct {
 	Readonly bool   `json:"readonly"`
 }
 
-type Namespace struct {
-	Type string `json:"type"`
-	Path string `json:"path,omitempty"`
-}
-
 type Platform struct {
 	OS   string `json:"os"`
 	Arch string `json:"arch"`

spec_linux.go

@@ -30,6 +30,11 @@ type Linux struct {
 	Devices          []string               `json:"devices"`
 }
 
+type Namespace struct {
+	Type string `json:"type"`
+	Path string `json:"path"`
+}
+
 type UserMapping struct {
 	From  int `json:"from"`
 	To    int `json:"to"`