Switching between ironwood and hawthorn

If you already have been working on a release of the devstack and you wish to switch between ironwood and hawthorn branch then run the following commands in the devstack directory.

cd ../ && find . | grep -E \"(__pycache__|\.pyc|\.pyo$)\" | sudo xargs rm -rf && cd devstack
make dev.checkout
make lms-shell
paver update_db

These commands, clear out pyc files, checkout the relevant branches, then update the dependencies and migrations.