Remove the "how to get help" banner because nobody reads it.

There's several indications that folks don't actually read this banner
when unexpected errors occur. If nobody's reading it, then it's just
wasting space in the output.

I would cite references, but will not because there's no need to shame
anyone.

Fixes elastic#1442

locales/en.yml

@@ -4,16 +4,6 @@
 #     for unformatted text.
 en:
   oops: |-
-    +---------------------------------------------------------+
-    | An unexpected error occurred. This is probably a bug.   |
-    | You can find help with this problem in a few places:    |
-    |                                                         |
-    | * chat: #logstash IRC channel on freenode irc.          |
-    |     IRC via the web: http://goo.gl/TI4Ro                |
-    | * email: [email protected]                |
-    | * bug system: https://logstash.jira.com/                |
-    |                                                         |
-    +---------------------------------------------------------+
     The error reported is: 
       %{error}
   logstash: