Client certificate in git seem buggy

Certificates generated via the `Makefile` in `riak/tests/resources` are fine, but the checked-in `client.crt` does not validate against `ca.crt`. `server.crt` is fine.

```
$ openssl verify -CAfile ca.crt client.crt
client.crt: /C=US/ST=Washington/O=Basho/OU=Riak Python Client/CN=certuser/emailAddress=clients@basho.com
error 20 at 0 depth lookup:unable to get local issuer certificate
```