fix a few small issues with walkthrough tests

These are all pretty basic. 
- We do not print out over 100 lines of output anymore when -v debug is specified. it is about 73 lines now. This may have decreased because we are batching commands now.
- For testHostCommands, ps -a changed slightly because we are using ptys. everything except for the ps process itself is identical.
This is kind of brittle. If you just accept either version, then it will work irrespective of the underlying Linux distribution.