[PATCH] Fix SASL/GSSAPI behaviour when talking to round-robin server

The attached patch against 0.35 fixes an obscure problem with Net::LDAP
when talking to a round-robin LDAP server(s) using SASL/GSSAPI
authentication.

Without it, the SASL layer is passed the round-robin name, but if, when
the SASL/GSSAPI layer attempts to canonicalise the address, it resolves
to a different host to the one IO::Socket used for its connection, a
service ticket for a conflicting server will be requested, and
authentication will fail.

The patched version has been tested with SASL GSSAPI binds to
round-robin and non round-robin addresses.

Please consider this for inclusion in the next Net::LDAP release.

Thanks,
Dominic

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Dominic Hargreaves, Systems Development and Support Team
Computing Services, University of Oxford