Add command to print ipolicy options

The output of this command can be used to create an exact copy of the
current instance policy specs. The command could be expanded to print all
the options used to create a group or the cluster.

Signed-off-by: Bernardo Dal Seno <bdalseno@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>