This patch removes the enable_firewall/enable_vpn options since
they were removed in Pike (deprecated since Juno). The FWaaS panel
is still enabled via the modern method (copying files into place).
The VPNaaS variable is no longer being used, so it is being removed.
Closes-Bug: 1735199
Change-Id: I7d42b2a857a7f0c9401becc68a152102fb702508