Change minion to node

Contination of #1111

I tried to keep this PR down to just a simple search-n-replace to keep
things simple.  I may have gone too far in some spots but its easy to
roll those back if needed.

I avoided renaming `contrib/mesos/pkg/minion` because there's already
a `contrib/mesos/pkg/node` dir and fixing that will require a bit of work
due to a circular import chain that pops up. So I'm saving that for a
follow-on PR.

I rolled back some of this from a previous commit because it just got
to big/messy. Will follow up with additional PRs

Signed-off-by: Doug Davis <dug@us.ibm.com>

hack/jenkins/README.md

@@ -70,7 +70,7 @@ gs://kubernetes-jenkins/logs/kubernetes-e2e-gce/
       gcp-resources-{before, after}.txt
       junit_{00, 01, ...}.xml
       jenkins-e2e-master/{kube-apiserver.log, ...}
-      jenkins-e2e-minion-abcd/{kubelet.log, ...}
+      jenkins-e2e-node-abcd/{kubelet.log, ...}
   12344/
     ...
 ```