Merge pull request #6477 from terminalmage/docs

pkg, not package
ssh: add missing import, fix typo

************* Module salt.ssh
E1101:439,18:prep_trans_tar: Module 'json' has no 'dumpd' member
E0602:454,4:prep_trans_tar: Undefined variable 'shutil'
ssh: add another missing import (`copy` std lib module)
Merge pull request #6478 from cvrebert/patch-2

ssh: add missing import, fix typo
Use correct keys when dealing with the defaults dict

When checking the defaults dict the keys "m_name" and "m_fun" are already renamed to "name" and "fun" so us arg instead of rarg
Add example of using expr_form
Merge pull request #6480 from UtahDave/doc_reactor

Add example of using expr_form
Merge pull request #6479 from andersbetner/issue6464

Fix for #6464
Fix cruft left by airplane commit
Add fix for #6464 to 0.16.2 release notes