As extensions options has been deprecated, API sample tests
should run against all extension enable.
This commit enables all extensions for all the remaining sample tests
and remove extensions specific tests and sample files.
Also remove extension setting specific logic from base test class
along with TODOs.
Partially implements blueprint api-sample-tests-with-all-extensions
Change-Id: I66b593760789e5b3b92137a672246f8d91e44cba