cred = Credential(filename = 'tmack.pl.sa.cred')
slicehrn = 'planetlab.us.pl.tmack'
print cred.get_privileges().save_to_string()
cred = Credential(filename = 'tmack.pl.sa.cred')
slicehrn = 'planetlab.us.pl.tmack'
print cred.get_privileges().save_to_string()