correcting some behaviors for $DOCKER_HOST, now uses container's private IP instead of localhost

internal/utils/nocopy.go

@@ -0,0 +1,8 @@
+package utils
+
+// empty struct that implements Locker interface
+// for hinting that no copy should be performed.
+type NoCopy struct{}
+
+func (*NoCopy) Lock()   {}
+func (*NoCopy) Unlock() {}