Ignore .bundle/.
Remove unused cookbooks from Cheffile.
Refactor zookeeper init setup for cloudera packages.

Future runit support work make calls to /etc/init.d/zookeeper less than
consistent, so instead we can invoke
/usr/bin/zookeeper-server-initialize directly, as the zookeeper user.

Also, only the last package will be used to trigger the initialize
command as it only needs to be run once.
De-duplicate the service[zookeeper] resources in the server recipe.
Add integration tests for CentOS & Cloudera packages.

Part of this commit refactors the serverspec tests in the server suite
to a common example group which can be shared among the other server
suites. Pretty decent, no?
Make Cloudera init command idempotent & refactor.
Fix unneeded conditional parens.
Arrayify server_packages attribute when installing packages.
Delay setting `zookeeperd_server = true` until converge phase.
Test CentOS 6.5 with Test Kitchen.
Make zk_init resource attribute-driven in server recipe.
Merge pull request #4 from hw-cookbooks/server-refactors

Server refactorings