Prevent errors on kDBConnection class change

If we ever going to change kDBConnection class, that is responsible for all database related interactions, then we must ensure that kDBLoadBalancer class, that allows to manage master/slave setups would also work. It's easy to forget adding a corresponding method to kDBLoadBalancer class for every kDBConnection class method.

To solve that problem I propose to create a public interface out of kDBConnection class and make both kDBConnection and kDBLoadBalancer implement it. This way PHP won't even allow to run a script if we don't add method to both classes.

What we must take care of anyway is to keep public interface up to date first.

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