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>

docs/api-reference/v1/definitions.html

@@ -481,7 +481,7 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 <div class="sect2">
 <h3 id="_v1_node">v1.Node</h3>
 <div class="paragraph">
-<p>Node is a worker node in Kubernetes, formerly known as minion. Each node will have a unique identifier in the cache (i.e. in etcd).</p>
+<p>Node is a worker node in Kubernetes. Each node will have a unique identifier in the cache (i.e. in etcd).</p>
 </div>
 <table class="tableblock frame-all grid-all" style="width:100%; ">
 <colgroup>