Fix break of deep scanning

Commit 265de8d7 forgot to add type 'kimchi-iso' to storage pool
type, which prevents deep scannning to execute.
Add it to API.json to fix this break.

Signed-off-by: Royce Lv <lvroyce@linux.vnet.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>