Unless the inventory consists of only localhost, we are going to check
it's presence and formatting, before actually starting validations.
Docstring of the 'read_cli_data_file' was expanded to provide more info.
Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I44a3081f64b169d874d1b790b9739ad13e556714