Allow dev access to db-B-001 for dereckson

Summary:
Temptatively introduce privileges separation to allow regular dev
maintenance work without using root account.

Allow to connect with MySQL workbench through a SSH tunnel
proxied by WindRiver.

Permissions on database with a % doesn't match a specific database,
and could match not-yet-existing databases, as such, drop requisite.

Test Plan: mysql -h db-B-001 -e "SHOW DATABASES;" -p

Reviewers: dereckson

Differential Revision: https://devcentral.nasqueron.org/D3125