Convert nwfilter ebiptablesApplyNewRules to virFirewall
    
    Convert the nwfilter ebtablesApplyNewRules method to use the
    virFirewall object APIs instead of creating shell scripts
    using virBuffer APIs. This provides a performance improvement
    through allowing direct use of firewalld dbus APIs and will
    facilitate automated testing.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>