Make sure to call chef-client and knife that we just built, not
just some random ones hanging around in $PATH.
Merge pull request #1583 from juliandunn/fix-hardcoded-binaries

Make sure to call chef-client and knife that we just built
Make local mode multi-tenant by default, add organization
and chef_server_root options.
Move local_mode deeper into chef-client so it happens
after node_name has been selected
Explicitly set organization when local mode is enabled
Allow user to pass nil for client_name and signing_validation_key
Put chef-zero in OSC 11 compat mode for data store tests
Robustify knife serve and knife serve tests (get rid of
intermittent failures)
Set chef-zero dependency to include bugfixes for tests