Vagrant bug (Warning: Authentication failure. Retrying...)

I was setting up several MySQL databases using Vagrant for testing and I kept getting this Warning which was preventing me from using the VMs:

Warning: Authentication failure. Retrying...

After wasting lots of time and reading up on people's post I was able to get it working. 

Patch info is here:

https://github.com/mitchellh/vagrant/issues/7610

Work around steps:

go to this dir:

/opt/vagrant/embedded/gems/gems/vagrant-1.8.5/plugins/guests/linux/cap

vi public_key.rb (need to run as sudo)

Look for this code:

            if test -f ~/.ssh/authorized_keys; then

              grep -v -x -f '#{remote_path}' ~/.ssh/authorized_keys > ~/.ssh/authorized_keys.tmp

              mv ~/.ssh/authorized_keys.tmp ~/.ssh/authorized_keys

Add this below that code:

chmod 0600 ~/.ssh/authorized_keys

End result will look like this:

Run "vagrant up" again