XD-534 Add shell integration tests for tap

XD-534 Add shell integration tests for tap
    Added tests for tap commands create, deploy and destroy
    Added AbstractTapIntegrationTest class that has tap commands execution methods
    Fix Tap commands result text
    Added util httpPostData method for 'http post'
    Added util checkIfCounterExists method for verifying counter existence
    Fixed StreamCommandTests & NamedChannelTests to use httpPostData() for 'http post'
    Fix executeStreamCreate() to add stream before assertion
    Add counter value check to verify the stream with counter sink
    - Added counter delete support at CountersController
    - Added shell command for "counter delete"
    - Updated tests to check for counter value