Bug 1455218 - Add public Etherpad URIs into the blacklist to take back the legacy keypress event behavior r=smaug

Etherpad has some bugs of handling non-printable key events.
https://github.com/ether/etherpad-lite/issues/3383

Unfortunately, Etherpad can be installed into any URI.  So, we cannot include
all of the instances into the blacklist but we should add URIs in the list
of Etherpad:
https://github.com/ether/etherpad-lite/wiki/Sites-that-run-Etherpad-Lite

I hope that Nightly testers don't use private Etherpad or non-listed Etherpad.

MozReview-Commit-ID: HSAVwGHhW75

--HG--
extra : rebase_source : bd1e579997c773de27476630a097bda70031107f

modules/libpref/init/all.js

@@ -238,7 +238,7 @@ pref("dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_i
 // if you need to limit under a directory, the path should end with "/" like
 // "example.com/foo/".  Note that this cannot limit port number for now.
 pref("dom.keyboardevent.keypress.hack.dispatch_non_printable_keys",
-     "docs.google.com,mail.google.com,hangouts.google.com,keep.google.com");
+     "docs.google.com,mail.google.com,hangouts.google.com,keep.google.com,*.etherpad.org/p/,etherpad.wikimedia.org/p/,board.net/p/,pad.riseup.net/p/,*.sandstorm.io,factor.cc/pad/,*.etherpad.fr/p/,piratenpad.de/p/,notes.typo3.org/p/,etherpad.net/p/,mensuel.framapad.org/p/,pad.ouvaton.coop/,pad.systemli.org/p/,pad.lqdn.fr/p/,public.etherpad-mozilla.org/p/,*.cloudron.me/p/,pad.aquilenet.fr/p/,free.primarypad.com/p/,pad.ondesk.work/p/,demo.maadix.org/etherpad/pads/");
 #else
 pref("dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_in_content", false);
 #endif