PYCBC-259: Don't delete old 'devmode' view after publish

This makes the developer experience more consistent and aligns our
behavior with that of the web UI.

Change-Id: I918877d7b8564cfa30e803d78a0dc7c1681bb27d
Reviewed-on: http://review.couchbase.org/41917
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>