Hotfix: Add pcs utility, add ordering for crmsh package

Change-Id: I15a6dd784282383e605a57049f94820972e5d03b
Merge "Hotfix: Add pcs utility, add ordering for crmsh package"
Tune mysql, galera, sqlalchemy backend settings

- Tune MySQL config settings to be more clouds-specific (reads much
  more common, reads:writes rate is 10(100):1)
  * Limit innodb_buffer_pool_size to 10G
  * If 1st puppet run, set innodb_log_file_size as 25% of
    innodb_buffer_pool_size (max 2G). Otherwise, recommend only
    (See https://tickets.opscode.com/browse/COOK-2100)
  * Reduce innodb_write_io_threads
  * Use low_priority_updates
  * Raise FD imits to 102400, max connections, open tables limits etc.
- Tune SQLAlchemy backend settings for Openstack (QueuePool related)
- Sync some MySQL+galera class params for MySQL class as well

Closes-bug: #1274784
Implements blueprint: optimize-db-performance-at-scale

Change-Id: I0e843022f04f53150da52858280034aad6aee987
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>