Verifies that RAUC bundles can be installed using NETCONF.
We choose to not add this to the "all" suite for now, as the qeneth
topologies do not run with full disk emulation.
To test locally, configure your "make run" instance to use the UEFI
loader, launch `make run`, and then run:
make INFIX_TESTS=test/case/ietf_system/upgrade.py test-run
busybox-extras contains an implementation of telnet, which is needed
for `qeneth console` to work. While we're updating, add tcpdump since
we'll need it sooner or later.
Joachim Wiberg