Fixed bug CORE-4054 : role not passed on external execute stmt

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@57703 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4055: Dialect is not set in internal connections to security database

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@57704 65644016-39b1-43b1-bf79-96bc8fe82c15