Allow import table to set hosting goal.

[EdColeman]

As a follow on the #3851. The export / import was modified to preserve the hosting goal of the export source. It may be desirable to allow the import to explicitly set a hosting goal independent and overriding the source.

One use case would be to export an active / online table to a system with fewer resources and then the destination desired host goal would possibly be on-demand or offline. If the import only supported the original state, there could be a need for more resources for the import until the table hosting goal could be changed to something less intensive.