The ssh_node function now supports printf style arguments. This is used to
simplify command execution on the nodes.
Curreltny, in addition to its old usage, it is used to drop extra
databases when replication is started.
The test seems to fail when executed outside of a debugger. A delay
between creating the connections and checking the connection count appears
to fix the problem.
Refactored the test to use stack allocated objects and favored assertion
style functions over conditional clauses with failing assertions inside
them.