tests: Update for scriptlet placement error handling

Signed-off-by: Stéphane Graber <stgraber@stgraber.org>

test/suites/clustering_instance_placement_scriptlet.sh

@@ -120,7 +120,7 @@ EOF
   ! INCUS_DIR="${INCUS_ONE_DIR}" incus init testimage c1 || false
 
   # Set instance placement scriptlet to one that sets an invalid cluster member target.
-  # Check that instance placement uses Incus's built in logic instead (as if setTarget hadn't been called at all).
+  # Confirm that we get a placement error.
   cat << EOF | incus config set instances.placement.scriptlet=-
 def instance_placement(request, candidate_members):
         # Set invalid member target.
@@ -130,8 +130,7 @@ def instance_placement(request, candidate_members):
         return
 EOF
 
-  INCUS_DIR="${INCUS_ONE_DIR}" incus init testimage c1 -c cluster.evacuate=migrate
-  INCUS_DIR="${INCUS_ONE_DIR}" incus info c1 | grep -q "Location: node1"
+  ! INCUS_DIR="${INCUS_ONE_DIR}" incus init testimage c1 -c cluster.evacuate=migrate || false
 
   # Set basic instance placement scriptlet that statically targets to 3rd member.
   cat << EOF | incus config set instances.placement.scriptlet=-

test/suites/clustering_move.sh

@@ -121,8 +121,7 @@ EOF
   INCUS_DIR="${INCUS_ONE_DIR}" incus move c2 --target @foobar3
   INCUS_DIR="${INCUS_ONE_DIR}" incus info c2 | grep -q "Location: node3"
 
-  # Ensure that setting an invalid target won't interrupt the move and fall back to the built in behavior.
-  # Equally distribute the instances beforehand so that node1 will get selected.
+  # Ensure that setting an invalid target causes the error to be raised.
   INCUS_DIR="${INCUS_ONE_DIR}" incus move c2 --target node2
 
   cat << EOF | INCUS_DIR="${INCUS_ONE_DIR}" incus config set instances.placement.scriptlet=-
@@ -134,8 +133,7 @@ def instance_placement(request, candidate_members):
         return
 EOF
 
-  INCUS_DIR="${INCUS_ONE_DIR}" incus move c1 --target @foobar1
-  INCUS_DIR="${INCUS_ONE_DIR}" incus info c1 | grep -q "Location: node1"
+  ! INCUS_DIR="${INCUS_ONE_DIR}" incus move c1 --target @foobar1 || false
 
   # If the scriptlet produces a runtime error, the move fails.
   cat << EOF | INCUS_DIR="${INCUS_ONE_DIR}" incus config set instances.placement.scriptlet=-