Code review comment for lp:~gary/launchpad/fix-db-devel-sourcecode

This tries to quickly work around the fact that our scripts do not handle different sourcecode.conf files, by syncing sourcecode.conf in devel and db-devel.

The right fixes, for later, include the following:

- Switch as much as possible to buildout from sourcecode branches, because buildout handles this situation just fine.
- Make ec2 and buildbot honor the revisions from the currently tested branch (see https://launchpad.net/bugs/508025 and https://launchpad.net/bugs/509759).
- Consider making db-devel and devel have their own sourcecode trees in development environments. It would still break in some cases, but would be better than what we have now.

Pre-impl with flacoste.

Gary