Add a kitchen test for the skip of dump file import on subsequent run of rs-lamp::dump_import

[arangamani]

The rs-lamp::dump_import recipe creates a touch file in /var/lib/rightscale with the dump file name when it imports the dump file for the first time. The recipe will check for the corresponding touch file and skip the import if the touch file exists.

There should be a test that runs the rs-lamp::dump_import 2 times and should check for the skip log message in the log file.

[douglaswth]

The idea for this that @arangamani and I came up with is this:

• We have a rake job for the test that runs kitchen converge twice before running verify
• We make a ServerSpec test that checks the log for the skip message

This relies on us moving to rake instead of strainer.