Add basic regress tests for ldapd.

- first pass of tests adding a DIT, then searching in it
- second pass of tests runs Net::LDAP regress suite against ldapd (not
all tests are passing, and that r

Add basic regress tests for ldapd.

- first pass of tests adding a DIT, then searching in it
- second pass of tests runs Net::LDAP regress suite against ldapd (not
all tests are passing, and that requires Net::LDAP installed and
distfiles present on the system)

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