Adding tag support for FirehoseDeliveryStreams

[MikeSchouw]

Closes issue #1059

Scan complete: 1 total, 1 nukeable, 0 filtered.

Do you really want to nuke these resources on the account with the ID xxx and the alias 'xxx'?
Waiting 15s before continuing.
eu-central-1 - FirehoseDeliveryStream - test - [Name: "test", tag:tag1: "value1", tag:tag2: "value2"] - triggered remove

Removal requested: 1 waiting, 0 failed, 0 skipped, 0 finished

eu-central-1 - FirehoseDeliveryStream - test - [Name: "test", tag:tag1: "value1", tag:tag2: "value2"] - waiting

Removal requested: 1 waiting, 0 failed, 0 skipped, 0 finished

eu-central-1 - FirehoseDeliveryStream - test - [Name: "test", tag:tag1: "value1", tag:tag2: "value2"] - removed

Removal requested: 0 waiting, 0 failed, 0 skipped, 1 finished

Nuke complete: 0 failed, 0 skipped, 1 finished.