phyp: add storage management driver

Add the storage management driver to the Power Hypervisor driver.
This is a big but simple patch, it's just a new set of functions.

This patch includes:
 * Storage driver: The set of pool-* and vol-* functions.
 * attach-disk function.
 * Support for IVM on the new functions.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/phyp/phyp_driver.h

@@ -30,6 +30,7 @@
 # include <config.h>
 # include <libssh2.h>
 
+# define MAX_KEY_SIZE (1024*4)
 # define LPAR_EXEC_ERR -1
 # define SSH_CONN_ERR -2         /* error while trying to connect to remote host */
 # define SSH_CMD_ERR -3          /* error while trying to execute the remote cmd */