new-app: configure jail mail relay and persist the jail's network alias

Two provisioning gaps in new-app:

- The jail's dma.conf inherited the base image's shared SMARTHOST/
  PORT/AUTHPATH, but never got a per-app MAILNAME - without one, dma
  can misroute mail for recipients on the jail's own apex domain as
  local delivery. EnableMail appends a MAILNAME of <app>.skiff.local,
  which can't collide with any real domain an app sends to or from.

- A classic jail's ip4.addr is only a bind restriction, not a route,
  until something aliases it onto a host interface. jail.conf.tmpl
  never set jail(8)'s own `interface` parameter, so nothing ever
  created that alias - confirmed on skiff-freebsd, where the address
  had twice been made to work via an ad hoc `ifconfig alias` that
  didn't survive a reboot. Setting `interface` lets jail(8) manage
  the alias itself, including on every boot.

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