Fix velocity deprecated configuration keys

All of the Velocity configuration keys used in
`PluginVelocityRuntimeProvider` are now marked as deprecated and were
producing warnings when plugin was starting.

This is replacing the deprecated keys with their new versions.

Change-Id: If62af6098a7db367e2ced41f92974f9a3d734050

github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java

diff --git a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
index e1b4d9b..1d81f62 100644
--- a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
+++ b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/velocity/PluginVelocityRuntimeProvider.java
@@ -29,12 +29,12 @@
 
 @Singleton
 public class PluginVelocityRuntimeProvider implements Provider<RuntimeInstance> {
-  private static final String VELOCITY_FILE_RESOURCE_LOADER_PATH = "file.resource.loader.path";
-  private static final String VELOCITY_FILE_RESOURCE_LOADER_CLASS = "file.resource.loader.class";
-  private static final String VELOCITY_CLASS_RESOURCE_LOADER_CLASS = "class.resource.loader.class";
-  private static final String VELOCITY_JAR_RESOURCE_LOADER_CLASS = "jar.resource.loader.class";
-  private static final String VELOCITY_JAR_RESOURCE_LOADER_PATH = "jar.resource.loader.path";
-  private static final String VELOCITY_RESOURCE_LOADER = "resource.loader";
+  private static final String VELOCITY_FILE_RESOURCE_LOADER_PATH = "resource.loader.file.path";
+  private static final String VELOCITY_FILE_RESOURCE_LOADER_CLASS = "resource.loader.jar.path";
+  private static final String VELOCITY_CLASS_RESOURCE_LOADER_CLASS = "resource.loader.class.class";
+  private static final String VELOCITY_JAR_RESOURCE_LOADER_CLASS = "resource.loader.jar.class";
+  private static final String VELOCITY_JAR_RESOURCE_LOADER_PATH = "resource.loader.jar.path";
+  private static final String VELOCITY_RESOURCE_LOADER = "resource.loaders";
   private final SitePaths site;
   private String pluginName;