Move new search helpers to utils cookbook

I just realized that it should really be in the utils cookbook, as the
crowbar cookbook is really specific to the admin node.
Merge pull request #898 from vuntz/move-search

Move new search helpers to utils cookbook
Use "no_role" as NodeObjects intended_role attribute default
Merge pull request #900 from bkutil/use_no_role_as_intended_role_default

Use "no_role" as NodeObjects intended_role attribute default
CrowbarController#element_info spec is order independent
Merge pull request #899 from bkutil/fix_element_info_spec

CrowbarController#element_info spec is order independent