Features: Configurable chef log location | Configurable chef-client version on container creating

[therobot]

Hello,

This PR attempts to implement both features mentioned above:

• Being able to declare a customizable path for chef-client log inside a lxc container, this path is hardcoded at the moment. I have also added the capability of being able to specify a cookbook for the chef-client template.
• Being able to install an specific chef-client version instead of the latest one, which is the only option at the moment.

Notes:

• I've been able to converge a test container inside a vagrant instance and register it to a fake chef-zero server that runs in the vagrant instance, in both 12.04 and 14.04 set ups. Haven't added tests yet. See the code inside test/fixtures/cookbooks/lxc-test/recipes/test-container.rb
• In order to at least being able to locally converge a vagrant instance I have been doing some cleanup in the kitchen / librarian side removing and updating stuff that does not work with my local workflow and other things that look not used or outdated. I'm completely open to bring some of this things back in order to get the PR accepted if necessary.

If more information or changes are needed, don't hesitate on asking.

[martinisoft]

Anyone able to review these changes? I think they are against master and not develop so it might need to be pointed to that branch instead.

[chrisroberts]

Hi! I'm working through these and have them locally fetched and cherry picked over, so no worries!

[martinisoft]

Awesome, thank you @chrisroberts