[chef] Update to machine_tag cookbook from RightScale

[Efrain Olivares < >]

Hello Chefs,

We (RightScale) have published an updated revision of a Chef cookbook.

machine_tag - https://github.com/rightscale-cookbooks/machine_tag

v1.0.6 

• Update tag validation regex. #13
• Update strainer gem version to 3.x

Thanks

Efrain

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Rightscale

http://www.rightscale.com