Renamed properties file and added validation.

I have renamed the properties file to robottelo.properties.sample. If
you try to run the tests without creating your own
robottelo.properties file you'll get a warning and the code will exit out.
Merge pull request #77 from omaciel/fixpropertiesfile

Renamed properties file and added validation.
Adds a property to set whether the tests are remote or local
Adding new property to the sample file