Log Message:
Update misc/py-anita to 1.37.  Changes from 1.36:

The global test() function is no longer supported, use the run_tests()
method of the Anita object instead.

When halting the VM, do not attempt to log in if already logged in.

Make the distinctive shell prompts different from one invocation of
anita to another, so that anita can run itself recursively on the VM
without the outer instance mistaking a shell prompt from an inner
instance for one of its own.