[python-ldap] syncrepl fix for pyasn1 >= 0.3

[Michael Ströder]

Although I'm not happy with all the if-statements I've committed a
slightly modified version of your submitted patch.

Please review CVS HEAD now!

Ciao, Michael.

P.S.:
Yes, I will provide another VCS repo soon because SF shuts down CVS at
2017-11-30.

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