Niels Thykier 6174d2c3f9
Create a MigrationItemFactory and migrate most code to use it
This is a step towards making migration unit-testable.  This step
reduces the need for global state (in the MigrationItem class as class
fields) and with another step we can remove the global state entirely
and enable unit tests to create migration items without having to
worry about other unit tests.

Signed-off-by: Niels Thykier <niels@thykier.net>
2018-12-31 12:00:50 +00:00
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