[#7] cookbook now works again when not installing separate java 

* Created a new suite called `confluence-installer-mysql-no-java` that reproduces the problem.
* Created a new attribute `node['confluence']['jre_home']` (not sure yet how to document this).
* It seemed logical to make the changes to `templates/default/confluence.init.erb` although it seems that `status_of_proc` accepts **any** argument in place of `$JAVA_HOME/bin/java` and would still work... I even tried `bin/java`, which makes no sens, and it still returns the correct answer (service running or not).
* Tested with mysql on:
  * centos-5
  * centos-6
  * debian-7
  * ubuntu-1204
  * ubuntu-1210
  * ubuntu-1304
  * ubuntu-1310
* Could not test on fedora flavors as test-kitchen crashes when trying to install mysql.