ipatests: Allow using FQDN with trailing dot as final hostname
    
    When creating a BaseHost instance, the machine's hostname was
    reconfigured to have the same shortname prepended the domain name
    of the domain where it was defined.
    
    However, it makes sense in certain use cases to define hosts
    that have hostnames other than belonging directly in the domain
    they were defined in.
    
    Treat input hostnames with trailing dots as static FQDNs that
    will not be changed by the name of the domain they were defined in.
    
    Reviewed-By: Petr Viktorin <pviktori@redhat.com>