Update mapping for 'Post As Json Templated'

Update mapping for 'Post As Json Templated'

Now 'mapping' for the *_As_*_Templated keywords should be
a dictionary and the value of the 'mapping' dictionary is
percent-encoded with an expectation that the value will replace
the value placeholder of the RFC8040 list segment.

Update OpenFlow plugin test cases using the keywords to provide
a dictionary. Also, replace the Bierman02 URL still used in the URL
templates, and change the placeholder to the value of the node list,
instead of just switch ID.

Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>
Change-Id: I0de33bd5670fdd8f11f464dfdd67b72b792688db