Fix state.highstate run when using salt master

retcode-passthrough option is available only for masterless salt-call.
fix typos
Merge pull request #4691 from blackbirdit/master

Fix typo that prevents "vagrant box add --cert certfile -name foo URL" from working
uPdate CHANGELOG
providers/docker: set preparing set to avoid data dir clear [GH-3873]
core: ignore capability error [GH-4684]
website/docs: update to clarify repackage [GH-4537]
website/docs: doc ca_cert settings [GH-4528]
Merge pull request #4472 from abele/fix/master/salt-retcode-passthrough

Fix state.highstate run when using salt master
Update CHANGELOG
Merge pull request #4545 from mrwhelan/master

website: fix typos