NIFI-3025: Bump nifi-spark-receiver's jackson version to match Spark 2.0.1

[randerzander]

For all changes:

• Is there a JIRA ticket associated with this PR? Is it referenced
  in the commit message?

• Does your PR title start with NIFI-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character.

• Has your PR been rebased against the latest commit within the target branch (typically master)?

• Is your initial contribution a single, squashed commit?

For code changes:

• Have you ensured that the full suite of tests is executed via mvn -Pcontrib-check clean install at the root nifi folder?

No code or doc changes, but I ran "mvn -Pcontrib-check clean install" successfully anyway.

[randerzander]

Tests all passed locally for me, also on travis-ci.. maybe the AppVeyor CI infrastructure has problems tonight?

I see two unrelated errors:

1. NPM errors during nifi-web build -- unrelated and not sure they're even errors? <3 npm
2. PersistentProvenanceRepository tests -- unsure about this one, but passed locally for me

[randerzander]

After opening and closing the PR to re-run tests, AppVeyor failed with a different error (testSendLargeFileHTTPWithProxy).

I think it's safe to say it's a problem with AppVeyor's boxes.

[olegz]

+1 Merging