Fixed CORE-4200: An uncommitted select of the pseudo table sec$users blocks new database connections

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58735 65644016-39b1-43b1-bf79-96bc8fe82c15
Cleanup - "Authentication" parameter from firebird.conf is overriden by "AuthServer"

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58736 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4241: Empty password will pass login

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58737 65644016-39b1-43b1-bf79-96bc8fe82c15