Use lower case condition keys

Documentation of hooks-jira and hooks-bugzilla has always been using
'code-review' instead of 'Code-Review', which is currently used in
gerrit master. To allow to continue using the old examples, we
transform condition keys to lower case.

Change-Id: I95cae5dc229dd61e3342388a842a44aa782eb5ce

hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/GerritHookFilterChangeState.java

diff --git a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/GerritHookFilterChangeState.java b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/GerritHookFilterChangeState.java
index 7b2e7bd..e621f6f 100644
--- a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/GerritHookFilterChangeState.java
+++ b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/GerritHookFilterChangeState.java
@@ -189,7 +189,7 @@
 
     public Condition(String key, String[] values) {
       super();
-      this.key = key;
+      this.key = key.toLowerCase();
       this.val = values;
     }