Remove solaris files

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

cmd/containerd/config_solaris.go

@@ -1,18 +0,0 @@
-// +build solaris
-
-package main
-
-import "github.com/containerd/containerd/server"
-
-func defaultConfig() *server.Config {
-	return &server.Config{
-		Root: "/var/lib/containerd",
-		GRPC: server.GRPCConfig{
-			Address: server.DefaultAddress,
-		},
-		Debug: server.Debug{
-			Level:   "info",
-			Address: server.DefaultDebugAddress,
-		},
-	}
-}