The api sample tests and functional tests already stopped to
run against with legacy v2 API. This patch removes the legacy
V2 API entry from api-paste.ini, it stops user from using
legacy V2 API. This patch also adds deprecated report in pipeline
factory method to notice the user update their api-paste.ini
after upgrade code.
Partially implements blueprint remove-legacy-v2-api-code
Change-Id: I1476b2e364032d7c98f71df0cd61f1d1c19e005d
5a64f57824