Fix creation of multiple alarms

[jessebye]

Issue #, if available: n/a

Description of changes: I discovered a bug in the controller's sdkFind logic that caused it to fail to create alarms in many cases. Basically, it was using DescribeAlarms with no alarm name input, so would get back a list of all alarms. If any alarms existed in the account already, it would determine the new alarm already existed and not create it.

This fix adds a post_build_request hook to read_many so it will get back a list of just the one alarm it's trying to find.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

Hi @jessebye. Thanks for your PR.

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[a-hilaly]

👍
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, jessebye

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