changes to allow for darwin compilation

Signed-off-by: baude <bbaude@redhat.com>

Closes: #1015
Approved by: baude

libpod/container_linux.go

@@ -0,0 +1,23 @@
+// +build linux
+
+package libpod
+
+import (
+	"github.com/containernetworking/plugins/pkg/ns"
+)
+
+type containerStateLinux struct {
+
+	// NetNSPath is the path of the container's network namespace
+	// Will only be set if config.CreateNetNS is true, or the container was
+	// told to join another container's network namespace
+	NetNS ns.NetNS `json:"-"`
+}
+
+// containerStateWindows is intentionally left as a blank stub
+type containerStateWindows struct {
+}
+
+// containerStateDarwin is intentionally left as a blank stub
+type containerStateDarwin struct {
+}