ssh_client fixture, updated/expanded ssh utils

- Needs a change to credentials.yaml, see credentials.yaml.template
- Tests!
selenium fixture now supports navigation fixtures
Merge pull request #79 from seandst/distributed-testing-selenium-shenanigans

selenium fixture now supports navigation fixtures
Merge pull request #83 from seandst/distributed-testing-ssh-shenanigans

ssh_client fixture, updated/expanded ssh utils
Add support for scp
Tell ssh client not to look for keys
Fix ssh_client_run_command test Assert.contains.
Merge pull request #91 from bcrochet/add-scp

Add support for scp
Turn tests into modules so pylint will run
Merge pull request #93 from bcrochet/pylint-enablement

Turn tests into modules so pylint will run
added ldap_config fixture, updated cfme_data, added use of fixture in roles test
update section of cfme_data that drives rbac test to reflect 5.2 menu changes
Merge pull request #62 from aweiteka/configure_ldap_fixture

added ldap_config fixture