Remove deprecated (and not use) code causing warning
In scala-ldap, we are using a old, deprecated piece of code to double-check a property on nodes in a LDAP tree.
That code cause warning and actually does nothing else than testing for a requirement, which can be done elsewhere without the deprecated code.
Moreover, the test is done with a "require" (ie an assert), so it would just explose in a stack trace.
I propose to let the old code in 4.1 to avoid any risk and correct it above: now that we have merged repos, we are going to see the warning more frequently.