[Refactoring todo] Remove retryHandler from current implementation

[darkdef]

In current implementation we have retryHandler in function internalExecute. Retry - is responsibility of user.

Need remove this code from Command.php

[mamadza]

is Retry for purpose of DeadLock or etc ? if yes , it's good thing to implement it in any approach

[darkdef]

In current implementation - retryHandler may be using for all sql queries.

[darkdef]

will not be decided