Previously they would conflict you had multiple security group rules
with the same ingress or egress ports but different source security
groups because only the CIDR blocks were considered (which are empty
when using source security groups).

Updated to include migrations (from clint@ctshryock.com)

Signed-off-by: Clint Shryock <clint@ctshryock.com>

* master: (23 commits)
  typo
  Update CHANGELOG.md
  provider/aws: Add docs for autoscaling_policy + cloudwatch_metric_alarm
  provider/aws: Add autoscaling_policy
  provider/aws: Add cloudwatch_metric_alarm
  Update CHANGELOG.md
  Update CHANGELOG.md
  provider/template: don't error when rendering fails in Exists
  Update CHANGELOG.md
  Added Azure SQL server and service support.
  Update CHANGELOG.md
  docs: clarify wording around destroy/apply args
  Getting Started: Added a Next Step upon finishing install.
  docs: add description of archive format to download page
  docs: snapshot plugin dependencies when releasing
  add v0.5.3 transitory deps
  Fixes support for changing just the read / write capacity of a GSI
  Change sleep time for DynamoDB table waits from 3 seconds to 5 seconds
  Remove request for attribute changes
  Fix AWS SDK imports
  ...

* master:
  provider/azure: Fix SQL client name to match upstream