Check the content and the length of certain input data and MySQL database and table names

Fixes issue https://github.com/telefonicaid/fiware-connectors/issues/114
What about "organization lenght greater than"? Using "organization header length" it seems that you mean to the length of the header itsefl (i.e. the "Fiware-Service" string).

BTW, maybe a better name for the constant ins ORG_MAX_LENGTH.