Test is also valid for back-hdb

Add OpenLDAP copyright statement

for compatibility with proxyAuthz control

(which was axed log ago)

- op->o_tmpmfunc setup

These calls belong in an ldap_destroy() library function.

Other pointers may have different representation.

Also don't lock op->o_conn->c_mutex.  It is already locked by slapd/abandon.c.

Use etest {...} | dtest {...} to test.