Import: Make #child_change work

The `#child_change` method should update the current import (the parent)
with a 'failed' or 'successful' status depending on the status of the
child passed in.

If the child has a failure status, the parent import should be updated
to failed. If the import is `#ready?`, that tells us that all children
have called `#child_change` without any problems, and we can update the
parent's status to be successful. THAT PARAGRAPH IS WRONG. We could have
`#ready?` with failed children. NEED TO UPDATE TO SUPPORT THAT.

Add a method that describes the possible "failing" statuses. These are
the ones that will cause 'failed' to be set on the parent.

Refs #3509, #3511

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