Replace underscore with a hyphen for Foreman CLI.

As per https://github.com/theforeman/hammer-cli-foreman/pull/108,
Foreman hammer CLI commands will replace underscores for hyphens.

A separate PR will be filed once Katello CLI goes through the same
changes (see http://projects.theforeman.org/issues/4709).
host and system unification test stubs
Fixed decorator for non-implemented tests
Fixed one more test
host and system unification test stubs - added unittest decorators
Merge pull request #530 from sthirugn/decoratorfix

Fixed decorator for non-implemented tests
Merge pull request #529 from cswiii/testcases

host and system unification test stubs
Added pass at the end of the test to make it consistent with other tests
Merge pull request #531 from sthirugn/testfix

Added pass at the end of the test to make it consistent with other tests
Merge pull request #527 from omaciel/replace-underscore-with-hyphen

Replace underscore with a hyphen for Foreman CLI.