Tim Jenness is correct (of course): this went into lsst_distrib too late for v12, but should be in the next weekly.
While it would be possible to shift it to lsst_apps with an RFC, I think we'd be better off taking the opportunity to make more substantial changes, clarifying the role of _apps, _distrib and other top level packages. I've heard various people muttering about this over the last few months, but it's lower on the priority list than the ongoing planning effort.
I'm going to close this as a "Won't Fix" until & unless that larger reorganization comes about. Robert Lupton, if you object and really do think it's important to shift this to _apps now, please reopen.