allow override of the cookbook used for runit templates

[popsikle]

This allows custom templates for the run it service (use case: lets us set ulimit settings and such)

[sunggun-yu]

Thank you for the great feature. and sorry for late.

[sunggun-yu]

@popsikle
Hi,
Thank you for the great idea. I think we can expand your idea.
For that, I would like to change the naming of attribute.

default['mongodb3']['template_cookbook']['mongos'] = 'mongodb3'
default['mongodb3']['template_cookbook']['A'] = 'mongodb3'
default['mongodb3']['template_cookbook']['B'] = 'mongodb3'

so that, we can apply this for current or future templates if we need.

please let me know your opinion.

[sunggun-yu]

Sorry, I change my mind (so quick)

please let me change the attribute name like below to be more clear.

default['mongodb3']['mongos']['runit_template_cookbook'] = 'mongodb3'

Thank you.