Make zuul more worker agnostic

* Remove mention of Jenkins from the codebase
* Remove unused dependency on python-jenkins
* Update docs to be suggestive of Jenkins but not require

Change-Id: I15f5462466899fb520aa66669f2e0b1d4fa1b98a
diff --git a/etc/status/public_html/index.html b/etc/status/public_html/index.html
index f5efce0..d09f44f 100644
--- a/etc/status/public_html/index.html
+++ b/etc/status/public_html/index.html
@@ -130,7 +130,7 @@
 <body>
     <div class="container">
         <h1>Zuul Status</h1>
-        <p>Real-time status monitor of Zuul, the pipeline manager between Gerrit and Jenkins.</p>
+        <p>Real-time status monitor of Zuul, the pipeline manager between Gerrit and Workers.</p>
 
         <div class="zuul-container" id="zuul-container"></div>
     </div>