Move dial funcs to dialer pkg

This reduces shim size from 30mb to 18mb

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

dialer/dialer_unix.go

@@ -0,0 +1,29 @@
+// +build !windows
+
+package dialer
+
+import (
+	"net"
+	"os"
+	"strings"
+	"syscall"
+	"time"
+)
+
+func isNoent(err error) bool {
+	if err != nil {
+		if nerr, ok := err.(*net.OpError); ok {
+			if serr, ok := nerr.Err.(*os.SyscallError); ok {
+				if serr.Err == syscall.ENOENT {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+func dialer(address string, timeout time.Duration) (net.Conn, error) {
+	address = strings.TrimPrefix(address, "unix://")
+	return net.DialTimeout("unix", address, timeout)
+}