[chef] Updates to machine_tag cookbook from RightScale

[Douglas Thrift < >]

Ohai Chefs,

We have published a new version of the machine_tag cookbook:

v1.0.5

• Update to test-kitchen 1.2.1 and use the new concurrency flag. (#12)
• Make the Vagrant tag support act like RightScale where machine tags are only unique by namespace and predicate. (#14)

-- 
Douglas Thrift
RightScale - Linux Systems Engineer
<http://www.rightscale.com/>