Merge pull request mongodb#126 from mongodb/spec-173

SPEC-173: Document tests conditional on server version

Merge pull request mongodb#128 from mongodb/jmikola-spec835

SPEC-835: Clarify that percent signs must be encoded in userinfo

Delete Max Staleness test "NoKnownServers" again.

New Max Staleness NoKnownServers test, prohibit maxStalenessSeconds=0.

Test PossiblePrimary isn't candidate for any read pref.

Add an automated test to assert that a hidden replica set member is r…

…ecognized as type RSOther

SDAM test: primary steps down and changes setName.

Noticed a bug in C Driver's updateRSWithPrimaryFromMember that wasn't
revealed by any SDAM test:

1. Discover primary, topology type is ReplicaSetWithPrimary
2. In next ismaster response from primary it has become secondary *and*
   changed setName

Expected: server removed, topology type changes to ReplicaSetNoPrimary

Actual: server removed but topology type remains ReplicaSetWithPrimary

Merge pull request mongodb#37 from ajdavis/SPEC-244-remember-electionId

Remember electionId

Delete useless electionid test.

Merge pull request mongodb#28 from ajdavis/remove-max-electionid

remove-max-electionid