Enhancement/restapi update

[BUGinator86]

Updated Pullrequest to also include tests for requests with bitbucket projectkey and slug. Also put creation of payload in HttpNotifier classes to make it possible to create different payloads for different versions of stash/bitbucket. Introduces ExtendedApacheHttpNotifier for extended payload and new selector that creates the ExtendedApacheHttpNotifier only if a BitBucket projectkey and slug is provided. Else the behaviour is the same as before.

Testing done

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