[bp/r50268][SEC] installer: Revert r50040 in favor of a different approach to database connection security

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/6.x@50274 b456876b-0849-0410-b77d-98878d47e9d5
[bp/r50269][SEC] installer: Revert r50036 in favor of a different approach to database connection security

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/6.x@50275 b456876b-0849-0410-b77d-98878d47e9d5