Replace the binary Wsk with REST interface WskRest

[houshengbo]

All the non-CLI related tests should sunset the wsk, and re-implement them with wskrest.

import common.wsk 
val wsk = new Wsk

need to be changed to

import common.rest.WskRest
val wsk = new WskRest

plus there may be changes to the rest of the tests as well, since the response result may have been changed.

[houshengbo]

There are 9 test cases:
CloudantHealthFeedTests
CloudantAccountActionsTests.scala
CloudantBindingTests.scala
CloudantDatabaseActionsTests.scala
CloudantFeedTests.scala
CloudantFeedWebTests.scala
CloudantMultiWorkersTests.scala
CloudantTriggerPersistencyTest.scala
CloudantRedundancyTests