2.5.x allows w=majority for standalone servers
This hits a different errorcode in 2.5.x (intentionally)
The order of fields is not guaranteed, and "sometimes" changes during writes

Fix test to work on all mongodb versions
Do another write to increase our chances of he 10 other being replicated
The request_id has been bumped by 3 at this point
Fix the weird skipif message with double reason

Stop right away when we know we aren't gonna run the test
Fix a segfault in the mongocollection-find_error-001.phpt failover test

When the server doesn't work, we need to unregister it from the manager,
otherwise we keep a dangling pointer to it, and crash when we try to
locate servers to use.

Also fix invalid read, using the wrong error variable on error
Make it fail faster when broken, and more clearly