tag support for vs create / edit

Adds the ability to specify tags both on the vs (aka cci) create
instance CLI / call as well as modify tags on the edit CLI / call.
Additionally this PR supports tags w/r/t exporting templates and create
using the --like option. Finally unit tests are included.

implements https://github.com/softlayer/softlayer-python/issues/354
The CI picked this up, but just to re-iterate (joke)... iteritems() doesn't exist in python 3. What was iteritems in python 2 is now items() in python 3. Because this isn't going to iterating over a large amount of data my rule has been to lean toward just using items().