tests still didn't work on the mini-testbed. The less important tests
have been removed - a few others just modified to work with fewer
resources.

The tbcmd test is an important one, which would lose something by being
smaller. So, I've made a copy of it which tests a slightly smaller set
of functionality, but will run on the mini-testbed.

on connectivity 2 testbeds.

easily allows tests to be shared across sets.