Support units other than milliseconds for the pg-upgrade timeout option

Summary

The current timeout option for pg-upgrade is in milliseconds. We should support other, more human friendly units as well.

Proposal

We should preserve the current default behavior, but I think we should support single letter suffixes to specify the unit. i.e. -T 12s.

We probably only need to support seconds, minutes, hours, and possibly days.

References

Availability and Testing

What risks does this change pose to our availability?

None, just a timeout option during upgrade

How might it affect the quality of the product?

No impact

What additional test coverage or changes to tests will be needed?

Additional unit testing required.

• Ensure time with no unit is treated as ms
• Ensure each new time unit is correctly tracked
• Check for bad unit characters

Will it require cross-browser testing?

Not tested at the browser level