taking in user-specified commands to run from the tools and execing them on each node before starting the appcontroller
not sanitizing commands to execute, since we actually want to exec that parameter
properly sending commands to exec between other machines
moved user_command parsing out of creds, so that we can pass it via soap without issues
added missing docstring on new method
Merge pull request #754 from shatterednirvana/bootstrap-commands

taking in user-specified commands to run from the tools and execing them