Fix percona bind_address
Fix percona bind_address

When percona was bound to a specific IP address (see commit below), it
broke this demo's db connection, as it wasn't assigning the correct
address.

Now, we just assign the bind_address in the chef.json of the
Vagrantfile.

Commit that caused the issue:

https://github.com/thirdwavellc/chef-mysql-cluster/commit/b98b680cfe4a8b37021c0b4e818488b22592b5c1

thirdwavellc/bedrock-test,thirdwavellc/bedrock-test,thirdwavellc/bedrock-test