* ios_user module - add sshkey support
* ios_user - Add version_added to sshkey option
* ios_user - pep8 indentation fixes in unit tests
* ios_user - use b64decode method that works on python 2 and 3
* Fix over-byte
* Update ios tests to call `provider`
To continue to support testing `connection: local`
* Fix command dict handling in ios_user
* Clean up unit tests, too
* changed collection arg to argregate on 2.4 network modules
* replace users with aggregate in eos_user, junos_user, nxos_user
* added version_added to places where we replaced users with aggregate in the docs
* fix ios_static_route test
* update tests to reference aggregate instead of collection/users
