err msg varies by db version MINOR
err msg varies by db version MINOR

Fixes CPAN tester failure:
http://www.nntp.perl.org/group/perl.cpan.testers/2010/02/msg6778661.html

jorol/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,kainwinterheart/mongo-perl-driver,kainwinterheart/mongo-perl-driver,jorol/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,jorol/mongo-perl-driver,gormanb/mongo-perl-driver,kainwinterheart/mongo-perl-driver,dagolden/mongo-perl-driver,xdg/mongo-perl-driver,gormanb/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,mongodb/mongo-perl-driver,dagolden/mongo-perl-driver,jorol/mongo-perl-driver,mongodb/mongo-perl-driver,mongodb/mongo-perl-driver,gormanb/mongo-perl-driver,xdg/mongo-perl-driver,kainwinterheart/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,dagolden/mongo-perl-driver,xdg/mongo-perl-driver,gormanb/mongo-perl-driver,dagolden/mongo-perl-driver