Merge container logic into start.sh

This whole container thinking is over-engineered and we will get to
it if and when we need to.

setup/start/mysql.cnf

@@ -0,0 +1,10 @@
+!includedir /etc/mysql/conf.d/
+!includedir /etc/mysql/mysql.conf.d/
+
+# http://bugs.mysql.com/bug.php?id=68514
+[mysqld]
+performance_schema=OFF
+max_connections=50
+# on ec2, without this we get a sporadic connection drop when doing the initial migration
+max_allowed_packet=32M
+