s4:dsdb Add 'lazy_commit' module to swallow the 'lazy commit' OID

s4:dsdb Add 'lazy_commit' module to swallow the 'lazy commit' OID

This allows this control to be specified as critical.  We support the
control because we choose to always be durable in our transactions.

We really, really need a 'duplicate request' API, as at the
moment we can't do this without a large, error-prone set of code that
cannot cope with new request fields or types.

Andrew Bartlett