This patch fixes a typo in the connection negotiation code in the Java
client.  Prior to this fix, channel binding information was not verified
during connection negotiation because the peer certificate was not set.

In addition, I modified the error handing code in Negotiator.java to
abort connection negotiation upon receiving SSLPeerUnverifiedException
due to the absence of the channel binding information or the presence
of the invalid one.

I also added a test to verify that Kudu Java client doesn't connect
to a Kudu server which doesn't provide valid channel binding information
during the connection negotiation phase.

Kudos to Andy Singer for pointing to the bug.

Change-Id: I7bfd428128e224f03901a6cd7b33283495a28d54
Reviewed-on: http://gerrit.cloudera.org:8080/14713
Tested-by: Kudu Jenkins
Reviewed-by: Adar Dembo <[email protected]>
Reviewed-by: Todd Lipcon <[email protected]>
(cherry picked from commit a0e896475c139d308e3b6e32110e97168b9562c6)
Reviewed-on: http://gerrit.cloudera.org:8080/14724
Reviewed-by: Alexey Serbin <[email protected]>