In the current gwtorm implementation, column renames for columns
with a check constraint are not supported by Apache Derby.
To rename a column with a check constraint the column constraint
must be dropped manualy. After that the column can be renamed by
the gwtorm implementation. After the renaming the constraint can
be added again.
Test plan:
* Replace H2 with Apache Derby, add derby to Buck tests rules as
new dependency and run the tests with `buck test`
* Set up new site with Apache Derby database and perform the tests
Bug: Issue 3441
Change-Id: I46e719ed54ea633c127c7bcd381b882e3a9b37ba
793d8697e6