[SEC] installer: Revert r50037 in favor of a different approach to database connection security

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50268 b456876b-0849-0410-b77d-98878d47e9d5
[SEC] installer: Revert r50025 in favor of a different approach to database connection security

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50269 b456876b-0849-0410-b77d-98878d47e9d5