Log Message:
Update ruby-ldap to 0.9.11.

0.9.11
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Allow passing SASL interaction options

This adds a hash parameter "options" to LDAP::Conn.sasl_bind, which
can take :authzid, :authcid, and :realm (and corresponding strings),
for SASL authentication.

Also, refactored the rb_scan_args inside rb_ldap_conn_sasl_bind to use
C's case fallthrough, leading to less code repetition.