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
Merge pull request #6481 from terminalmage/docs

Add fix for #6464 to 0.16.2 release notes
Add unmounted function to the mount state.

Add the ability to unmount a directory from the filesystem.
Merge pull request #6482 from jesusaurus/feature/unmount

Add unmounted function to the mount state.
Don't require opts in unmounting
Forgot to remove that bit
Merge pull request #6483 from jesusaurus/feature/unmount

Forgot to remove that bit
Fix rst syntax in 0.16.2 release notes
Merge pull request #6484 from terminalmage/docs

Fix rst syntax in 0.16.2 release notes
Fix RabbitMQ link in 0.16.2 release notes
Merge pull request #6486 from terminalmage/docs

Fix RabbitMQ link in 0.16.2 release notes
Update deploy seq for noblock changes