Integration with Sense AWS. Fabric slice expiring fails to to delete AL2S connection.

[abessiari]

When the FABRIC slice expires, it will fail to delete the OESS connection which depends on the deletion of the AWS direct connect VPC attachment. This OESS connection might be incorrectly reused by subsequent workflows using the same workflow name.

NOTE: Calling fabfed workflow destroy will only delete the sense portion if the FABRIC slice has expired.

[xi-yang]

Potential features design:

1. immediately renew the FABRIC slice to last longer. (-show should give a warning about the expiry and potential issues, like OESS connection not going away ...)
2. Develop a -renew operation for the workflow session.
3. Register with a provider (or 3rd party) notification service (email / text / slack etc.) to remind users to renew or destroy the workflow before the expiry.

[xi-yang]

@abessiari Let's use fablib slice.renew() call to extend a FABRIC slice life time to 14 days. This should buy us time to clean up most of workflows.

https://github.com/fabric-testbed/fabrictestbed-extensions/blob/e716c26b0aa8d04a8103922bb892500329f22c2d/fabrictestbed_extensions/fablib/slice.py#L1409

14 days is the default max number of days for renewal. With Slice.NoLimitLifetime permission tag on a project, we can do up to 26 weeks.