Reduce cloudformation deploy command polling delay

[sanathkr]

Customers have asked for a faster deployment time.
See aws/serverless-application-model#125. This fix should
at least make the command complete as soon as cloudformation completes.

[sanathkr]

@JordonPhillips can I get a review on this? It might be a small change but could give good wins.

[JordonPhillips]

Looks good to me. I'll merge this later today

[codecov-io]

Codecov Report

Merging #2686 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2686      +/-   ##
===========================================
+ Coverage    95.56%   95.56%   +<.01%     
===========================================
  Files          151      151              
  Lines        11800    11801       +1     
===========================================
+ Hits         11277    11278       +1     
  Misses         523      523

Impacted Files	Coverage Δ
awscli/customizations/cloudformation/deployer.py	96.05% <100%> (+0.05%)	⬆️

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[michaellieberherr]

@sanathkr @JordonPhillips : This fix introduces an other issue, you run into "WaiterError: Waiter StackCreateComplete failed: Max attempts exceeded" if you have a template with for instance CloudFront resources (takes 10min+). I think the fix would be to increase the max retry attempts waiter.config.max_attempts = 720 too, so that the max wait time will still be 60 mins in accordance to https://github.com/boto/botocore/blob/develop/botocore/data/cloudformation/2010-05-15/waiters-2.json#L24

[sanathkr]

@michaellieberherrr good point. We should change max attempts as well. Can you send a PR for it?

[Seblat5ch]

I have submitted the pull request before seeing this discussion. However rather than increasing the max attempts we could just tweak the polling interval. #2761

[sanathkr]

Nah, I would rather increase the max attempts. Could you make that change, instead? It optimizes for both long running tasks and quick tasks