Suppress warning CHEF-3694 on chefspec for log dir

[joelhandwell]

This PR will suppuress following warning in case running chefspec using percona cookbook in a wrapper cookbook:

[2015-05-22T22:23:57+00:00] WARN: Cloning resource attributes for directory[/var/log/mysql] from prior resource (CHEF-3694)
[2015-05-22T22:23:57+00:00] WARN: Previous directory[/var/log/mysql]: /tmp/d20150522-11171-wy6kil/cookbooks/percona/recipes/configure_server.rb:71:in `from_file'
[2015-05-22T22:23:57+00:00] WARN: Current  directory[/var/log/mysql]: /tmp/d20150522-11171-wy6kil/cookbooks/percona/recipes/configure_server.rb:94:in `from_file'

[joelhandwell]

rebased on top of 182cddb

[phlipper]

@joelhandwell thank you very much! I rebased this on top of the latest master and merged it in as #319.

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