CDRIVER-1972 don't log warning if connect fails
CDRIVER-1972 don't log warning if connect fails

Now that we implement Happy Eyeballs, a successful IPv4-only connection
often involves a failed IPv6 attempt. Don't log a warning to stderr
about it.

remicollet/mongo-c-driver,ajdavis/mongo-c-driver,acmorrow/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,rcsanchez97/mongo-c-driver,derickr/mongo-c-driver,mongodb/mongo-c-driver,remicollet/mongo-c-driver,beingmeta/mongo-c-driver,mongodb/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,jmikola/mongo-c-driver,jmikola/mongo-c-driver,ajdavis/mongo-c-driver,beingmeta/mongo-c-driver,derickr/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver,rcsanchez97/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,ajdavis/mongo-c-driver,remicollet/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,ajdavis/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,remicollet/mongo-c-driver,acmorrow/mongo-c-driver,rcsanchez97/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,beingmeta/mongo-c-driver,ajdavis/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,beingmeta/mongo-c-driver