Make reviewer.enableByEmail inheritable

This change makes the config inheritable, adds it to PutConfig
and adapts the test code and docs where needed.

The GWT UI is adapted such that the config can be set using the UI
control.

Change-Id: I7b4a52eebbb69c44c1095a6a4ea3e402d1eb4206

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/ProjectInfoScreen.java

@@ -672,6 +672,7 @@ public class ProjectInfoScreen extends ProjectScreen {
         esp,
         rsp,
         getBool(rejectImplicitMerges),
+        getBool(enableReviewerByEmail),
         maxObjectSizeLimit.getText().trim(),
         SubmitType.valueOf(submitType.getValue(submitType.getSelectedIndex())),
         ProjectState.valueOf(state.getValue(state.getSelectedIndex())),

gerrit-gwtui/src/main/java/com/google/gerrit/client/projects/ProjectApi.java

@@ -147,6 +147,7 @@ public class ProjectApi {
       InheritableBoolean enableSignedPush,
       InheritableBoolean requireSignedPush,
       InheritableBoolean rejectImplicitMerges,
+      InheritableBoolean enableReviewerByEmail,
       String maxObjectSizeLimit,
       SubmitType submitType,
       ProjectState state,
@@ -170,6 +171,7 @@ public class ProjectApi {
     in.setSubmitType(submitType);
     in.setState(state);
     in.setPluginConfigValues(pluginConfigValues);
+    in.setEnableReviewerByEmail(enableReviewerByEmail);
 
     project(name).view("config").put(in, cb);
   }
@@ -294,6 +296,13 @@ public class ProjectApi {
       setRequireSignedPushRaw(v.name());
     }
 
+    final void setEnableReviewerByEmail(InheritableBoolean v) {
+      setEnableReviewerByEmailRaw(v.name());
+    }
+
+    private native void setEnableReviewerByEmailRaw(String v)
+        /*-{ if(v)this.enable_reviewer_by_email=v; }-*/ ;
+
     private native void setRequireSignedPushRaw(String v)
         /*-{ if(v)this.require_signed_push=v; }-*/ ;