Support RFC2307 schema

[anaxdev]

Hello,

We are using a LDAP server configured in RFC2307 schema, in which the group membership is defined by another way as follows:

dn: cn=Admin,ou=groups,dc=mydomain,dc=dev
cn: Admin
gidnumber: 500
memberuid: cn=myname,ou=users,dc=mydonmain,dc=dev
memberuid: myuser
objectclass: posixGroup
objectclass: top

And the ParseDN func returns the error "DN ended with incomplete type, value pair".

Looks like currently go-ldap/ldap supports a kind of schema that search for user's group by it's dn. (RFC4514)
RFC2307 allows to store and manage user and group information in a format compatible with Unix systems.
It will be better if go-ldap/ldap can add an additional condition to search for user's group by it's memberuid also. (RFC2307)
Thanks!