NEO: drop support for ZODB 3

software/neoppod/software-zodb3.cfg

-[buildout]
-extends = software.cfg
-
-[neoppod]
-eggs = neoppod[admin, ctl, master, storage-importer, storage-mysqldb, tests]
-  ${python-mysqlclient:egg}
-  ZODB3
-patch-binary = ${patch:location}/bin/patch
-ZODB3-patch-options = -p1
-ZODB3-patches =
-  ${neoppod-repository:location}/ZODB3.patch
-
-[versions]
-ZODB3 = 3.10.7+SlapOSPatched001
-transaction = 1.1.1
-zdaemon = 2.0.7