Better max ispec defaults

Instead of being equal to the minimum ones, these are reusing current
constants.
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

lib/constants.py

@@ -1873,11 +1873,11 @@ IPOLICY_DEFAULTS = {
     ISPEC_NIC_COUNT: 1,
     },
   ISPECS_MAX: {
-    ISPEC_MEM_SIZE: 128,
-    ISPEC_CPU_COUNT: 1,
-    ISPEC_DISK_COUNT: 1,
-    ISPEC_DISK_SIZE: 1024,
-    ISPEC_NIC_COUNT: 1,
+    ISPEC_MEM_SIZE: 32768,
+    ISPEC_CPU_COUNT: 8,
+    ISPEC_DISK_COUNT: MAX_DISKS,
+    ISPEC_DISK_SIZE: 1024 * 1024,
+    ISPEC_NIC_COUNT: MAX_NICS,
     },
   ISPECS_STD: {
     ISPEC_MEM_SIZE: 128,