Smoke tests for the Ironic CLI commands
which checks basic actions with node command like
create, update, delete etc.
Add get_table_headers() method that allows to
get table header from cmd output.
Add 'utils' module
Table structure tests have been updated.
Change-Id: If60b3720e9ce9a6a6c7e35880bf3f9c661d6f259
Implements: blueprint ironicclient-functional-tests
