Generate IAM reports

[joshlarsen]

Several IAM reports generate useful metadata about credential and service usage:

• credential_report
• organization_access_report
• service_last_accessed_details

Each of these report require generating the report (and waiting) prior to accessing the details. The current plan is to implement these using the SDK waiters. Since this will slow down considerably, it will likely be a separate command line option that is disabled by default.

[joshlarsen]

These don't actually require/allow waiters. However, generating the reports outside of Recon is a simpler approach. This commit added support for collecting and parsing the credential report.

[joshlarsen]

Add command line option to generate the report and wait.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[joshlarsen]

Enable generating credential report by default and wait for it to complete. Add command line option -g to skip generation.

In iam.rb, generate report unless option -g. Poll every 5 seconds to check for completion. Will occupy one thread waiting for completion.