[cloud] Add retries/backoff to ec2_vpc_subnet module (#31870)

* Allow backoff for describe_subnets

Improve exception handling to latest standards

* Add integration test suite for ec2_vpc_subnet

* Add test for creating subnet without AZ

Fix bug identified by test

Fixes #31905
This commit is contained in:
Will Thames 2017-11-17 04:09:42 +10:00 committed by Ryan Brown
commit 46c4f6311a
6 changed files with 255 additions and 45 deletions

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cloud/aws
posix/ci/cloud/group1/aws