[Core] Transfer retries

[AronPerez]

In the face of network faults, DataFed is canceling tasks. This needs to be controlled with an option. Instead, the default Globus behavior should be used, if a user specifically wants to cancel a transfer after a determined number of faults that is an option they can specify. This is particularly important when first testing a repository and attempting to detect network errors, but it is also useful to cancel tasks early in cases where there is high network traffic and an alternative transfer request to a different Globus endpoint might be preferable.

https://github.com/ORNL/DataFed/tree/JoshuaSBrown-feature-allow-globus-transfer-retries