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347537f1b3
A privileged systemd-based NOS container (Cisco XRd boots /usr/sbin/init)
runs systemd-udevd, which on startup coldplugs every device it can reach.
In privileged mode that includes the HOST's USB/input/audio/disk devices,
so every XRd start reconnects USB, mutes audio, and disrupts the host
journal -- highly disruptive on Linux desktops (caught in the act: the
container's udevd was even rescanning the host BTRFS root device).
XRd doesn't need udev (its interfaces are pre-created by GNS3 veth and
mapped via XR_INTERFACES). Add two opt-in env vars, consumed host-side at
container create time in the inherited DockerVM.create (so VendorDockerVM
nodes get it too):
GNS3_MASK_UDEV=1 -> bind /dev/null over the udevd unit, its two
activation sockets, and the coldplug/settle
trigger services
GNS3_MASK_SYSTEMD=u1,u2 -> bind /dev/null over arbitrary units in
/etc/systemd/system/ (comma/semicolon list)
Only injected when set, so ordinary nodes are unaffected.