Update etherpad and etherpad puppet manifests.

* manifests/site.pp: Pass new mysql DB variables to
openstack::etherpad*.

* modules/etherpad_lite/manifests/apache.pp: Fix broken /etc/ssl/certs
permissions (0700 -> 0755).

* modules/etherpad_lite/manifests/init.pp: Update default nodejs and
etherpad versions. Remove ep_headings plugin install. New plugin define
should be used for this instead. Stop making the etherpad-lite ref to
checkout optional (defaults to develop). Note these changes are probably
not going to be backward compat.

* modules/etherpad_lite/manifests/plugin.pp: Define to install etherpad
lite plugins.

* modules/etherpad_lite/manifests/site.pp: Simplify DB support and
remove support for the dirty DB type.

* modules/etherpad_lite/templates/etherpad-lite_settings.json.erb: Bring
settings erb up to par with latest template.

* modules/etherpad_lite/templates/etherpadlite.vhost.erb: Update rewrite
rules for new etherpad. Instead of allowing nice pad urls rooted at /
redirect these url to /p/padname. Etherpad does not deal well with a
change in root path as /p/ is hardcoded in many places.

* modules/openstack_project/manifests/etherpad.pp
* modules/openstack_project/manifests/etherpad_dev.pp:
Update to use new etherpad module setup. MySQL DBs are now externally
managed, pass in needed connection info.

* modules/mysql_backup/manifests/backup_remote.pp: New define to backup
remote DB servers.

* modules/mysql_backup/templates/my.cnf.erb: Template for a my.cnf to be
used by the cron in backup_remote.pp. Allows for easy connectivity from
server using MySQL DB as root.

Change-Id: I1250297674b91e81d59cd28c07c52e09967ca548
Tune apache for etherpad lite.

* modules/etherpad_lite/manifests/apache.pp: Install apache etherpad
lite connection tuning config file.

* modules/etherpad_lite/files/apache-connection-tuning: Configure the
Apache MPM Worker module to run up to 64 processes with 32 threads each
for a grand total of 2048 client connections maximum. This should be
relatively safe as etherpad connections are not very heavy. Most
connections come from users that lurk, they don't provide any input
that creates writes to the database. For example at a design summit we
may have 8 design room seach with an etherpad open, in each room there
may be 20 people connected to the etherpad but only 2-4 writing to it.

Change-Id: I3f406af1204b993d2b083180f17cafcf4f62f5bc
Merge "Update etherpad and etherpad puppet manifests."
Merge "Tune apache for etherpad lite."