The BER API is currently used by ldap, ldapd, ldapctl, ypldap, snmpd, and
snmpctl. Separate copies of ber.[ch] have existed and been maintained in sync
in ldap, ldapd, ypldap and snmpd.

This commit moves the BER API into /usr/lib/libutil. All current consumers
already link libutil. ldapd and snmpd regress passes, and release builds.

With help from tb@ and guenther@.

ok deraadt@, tb@

rm a few more $Id which cannot be useful

LDAP returns values as OCTET STRINGs, which can be LDAPStrings, but isn't
always the case. This caused some malformed output when querying databases
returning data containing NUL-bytes. Fix this by also returning the
actual size.

With this diff we should produce basically identical output to openldap's
ldapsearch.

Lots of back and forths with claudio@

OK claudio@

branches: 1.1.1;
Initial revision