[git] Git: force user and password prompt

None of those worked for me. I was trying to clone a directory from a private git server and entered my credentials false and then it wouldn't let me try different credentials on subsequent tries, it just errored out immediately with an authentication error.

What did work was specifying the user name (mike-wise)in the url like this:

   git clone https://[email protected]/someuser/somerepo.git