iPolicy: enable by default all storage templates

… otherwise we can't run tests or simulations using non-default
templates. Tests still pass.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

htools/Ganeti/HTools/Types.hs

@@ -254,7 +254,7 @@ defIPolicy = IPolicy { iPolicyStdSpec = defStdISpec
                      -- hardcoding here since Constants.hs exports the
                      -- string values, not the actual type; and in
                      -- htools, we are mostly looking at DRBD
-                     , iPolicyDiskTemplates = [DTDrbd8, DTPlain]
+                     , iPolicyDiskTemplates = [minBound..maxBound]
                      , iPolicyVcpuRatio = C.ipolicyDefaultsVcpuRatio
                      , iPolicySpindleRatio = C.ipolicyDefaultsSpindleRatio
                      }