Use a template to set the contents of the CommentEmails.

Add an admin editable Comment.vm template used to format the
contents of the comment emails.

Change-Id: Ic8e9cf6c3b60ae0c4a0e8a05537cf308a40ee694

gerrit-server/src/main/resources/com/google/gerrit/server/mail/Comment.vm

@@ -0,0 +1,47 @@
+## Copyright (C) 2010 The Android Open Source Project
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+## http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+##
+## Template Type:
+## -------------
+## This is a velocity mail template, see: http://velocity.apache.org and the
+## gerrit-docs:config-mail.txt for more info on modifying gerrit mail templates.
+##
+## Template File Names and extensions:
+## ----------------------------------
+## Gerrit will use templates ending in ".vm" but will ignore templates ending
+## in ".vm.example".  If a .vm template does not exist, the default internal
+## gerrit template which is the same as the .vm.example will be used.  If you
+## want to override the default template, copy the .vm.exmaple file to a .vm
+## file and edit it appropriately.
+##
+## This Template:
+## --------------
+## The Comment.vm template will determine the contents of the email related to
+## a user submitting comments on changes.  It is a ChangeEmail: see
+## ChangeSubject.vm and ChangeFooter.vm.
+##
+#if ($email.coverLetter || $email.inlineComments)
+Comments on Patch Set $patchSet.patchSetId:
+
+#if ($email.coverLetter)
+$email.coverLetter
+
+#end
+#if($email.inlineComments)$email.inlineComments#end
+#if ($email.changeUrl)
+To respond, visit $email.changeUrl
+
+#end
+#end