Add initial containerd *Client

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

client_unix.go

@@ -0,0 +1,17 @@
+package containerd
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"time"
+)
+
+func dialer(address string, timeout time.Duration) (net.Conn, error) {
+	address = strings.TrimPrefix(address, "unix://")
+	return net.DialTimeout("unix", address, timeout)
+}
+
+func dialAddress(address string) string {
+	return fmt.Sprintf("unix://%s", address)
+}