Return plugin name rather than hard-coded "Jira"

Bug: Issue 2865
Change-Id: I2c516972de0ad1da5a0f93804f54fe7dc18374da

src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraItsFacade.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraItsFacade.java b/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraItsFacade.java
index 17385b6..cd20842 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraItsFacade.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraItsFacade.java
@@ -68,7 +68,7 @@
 
   @Override
   public String name() {
-    return "Jira";
+    return pluginName;
   }
 
   @Override