DDB is considered healthy in UPDATING status

[Cai41]

Description of changes:
Based on: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithTables.Basics.html#WorkingWithTables.Basics.UpdateTable

When you issue an UpdateTable request, the status of the table changes from AVAILABLE to UPDATING. The table remains fully available for use while it is UPDATING. When this process is completed, the table status changes from UPDATING to AVAILABLE.

If we are updating a table's IOPS or billing mode, the UPDATING status can remain few minutes to one hour. This prevents KCL thread from starting. However based on DDB documentation, it is still functioning during UPDATING process, so KCL thread should be able to continue in this situation.

mvn clean install -DskipITs passed.

Note : This change is the same as the pull request in v1.x branch: #712

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[Cory-Bradshaw]

Change looks good to me. Thanks for helping keep the KCL versions at parity here.