Fix #530 Remove very old methods

* Remove deprecated getConnector methods from Instance
* Remove deprecated ZooKeeperInstance constructors
* Properly deprecate ZooKeeperInstance constructor which depends on
deprecated ClientConfiguration
* Fix warnings from deprecated types referenced (including javadoc
references)
diff --git a/src/main/java/org/apache/accumulo/proxy/ProxyServer.java b/src/main/java/org/apache/accumulo/proxy/ProxyServer.java
index a6473a9..d9fc9d7 100644
--- a/src/main/java/org/apache/accumulo/proxy/ProxyServer.java
+++ b/src/main/java/org/apache/accumulo/proxy/ProxyServer.java
@@ -195,7 +195,9 @@
     if (useMock != null && Boolean.parseBoolean(useMock))
       instance = DeprecationUtil.makeMockInstance(this.getClass().getName());
     else {
-      instance = new ZooKeeperInstance(ClientConfConverter.toClientConf(props));
+      @SuppressWarnings("deprecation")
+      Instance i = new ZooKeeperInstance(ClientConfConverter.toClientConf(props));
+      instance = i;
     }
 
     try {