add packaging dependency information

(backported from trunk revisions 29818 and 29819)

src/BTrees/DEPENDENCIES.cfg

 persistent
 transaction
+zope.interface

src/ZODB/DEPENDENCIES.cfg

@@ -4,3 +4,5 @@ persistent
 transaction
 # referenced by ZODB.config and related tests
 ZEO
+zope.interface
+zope.testing

src/persistent/DEPENDENCIES.cfg

 # the following are needed by the tests
 transaction
 ZODB
+zope.interface
+zope.testing

src/transaction/DEPENDENCIES.cfg

 ZODB
+zope.interface