Allows multiple query rewrite

[renecannao]

In the current implementation of Query_Processor and mysql_query_rules , a query is rewritten only at the end of the analysis of the rules of mysql_query_rules.
This leads to the fact that a query can only be rewritten once.
To allow multiple rewrites a lot of code needs to changed, because after each re-write we need to recalculate:

• original query
• digest

[renecannao]

This is already implemented.

v1.2.2 introduces a new variable mysql-query_processor_iterations

When query rules are processed, even if flagOUT is set rules are processed in numerical order.
This new variable allows to jump back (reset rule_id to 0) N amount of times.
Using this variable is possible to implement loops.
Futhermore, a loop is possible with only one rule setting flagIN=flagOUT .
The default is 0. The maximum value is 1000000 .