Don't clobber sml_type when converting SLAPI mods

modifications to be applied by the backend atomically with a modify
RDN request.

Handle updating of RDN values in frontend.

Code that calls a backend's be_modrdn should call slap_modrdn2mods(op, rs)
before invoking the backend and cleanup with slap_mods_free( op->orr_modlist, 1 ).
See do_modrdn() for an example.

in connection_fake_init()) too)

where merge controls was not called)

check passes

on Solaris, [v][sf][n]printf doesn't like NULL; on Solaris 10 strerror_r apparently returns NULL in some cases (ITS#4285)

cleanup and clarify the threading issues with back-ldap and back-meta when looping back to the same DSA (ITS#4141)

sounds like wiping the issues under the carpet, but test036 behaves much better if the target systems are less loaded