Trim the amount of data that the Chef jig is saving to the node_role walls. [1/1]

This adds a function that does a deep_diff on Hashes, and uses it to
filter out redundant data from the data the Chef jig wants to save on the wall.

 .../barclamp_chef/app/models/barclamp_chef/jig.rb  |   28 ++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

Crowbar-Pull-ID: 21026a44e2c9fbbd5564c6f344b930bcb719c3d9

Crowbar-Release: development