tests: remove redundant DISTRO_FEATURES appends from build fixtures

The -R conf files used by test build fixtures appended DISTRO_FEATURES
values that are already provided by meta-virt-host.conf (virtualization,
vcontainer, systemd). BitBake tracks append operations in task hashes,
so a duplicate append changes the hash and invalidates sstate for every
recipe that depends on DISTRO_FEATURES — causing full rebuilds even
when the image was just built.

Only append features genuinely needed by the test profile and not
already present in the base config:
- k3s: append only "k3s" (virtualization already in base)
- xen: append only "xen vxn" (virtualization systemd vcontainer in base)
- incus: no append needed (CONTAINER_PROFILE alone is sufficient)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

3 files changed, 2 insertions, 3 deletions

diff --git a/tests/test_incus_runtime.py b/tests/test_incus_runtime.py
index ea5eb1fc..4314709b 100644
--- a/tests/test_incus_runtime.py
+++ b/tests/test_incus_runtime.py
@@ -70,7 +70,6 @@ def incus_image(request):
         build_dir, "container-image-host",
         extra_vars={
             "CONTAINER_PROFILE": "incus",
-            "DISTRO_FEATURES:append": " virtualization",
         },
     )
     if result.returncode != 0:
diff --git a/tests/test_k3s_runtime.py b/tests/test_k3s_runtime.py
index d26b9164..eb9600dd 100644
--- a/tests/test_k3s_runtime.py
+++ b/tests/test_k3s_runtime.py
@@ -362,7 +362,7 @@ def k3s_image(build_dir):
         build_dir, "container-image-host",
         extra_vars={
             "CONTAINER_PROFILE": "k3s-host",
-            "DISTRO_FEATURES:append": " k3s virtualization",
+            "DISTRO_FEATURES:append": " k3s",
         },
     )
     if result.returncode != 0:
diff --git a/tests/test_xen_runtime.py b/tests/test_xen_runtime.py
index 790a25bf..b31153bd 100644
--- a/tests/test_xen_runtime.py
+++ b/tests/test_xen_runtime.py
@@ -239,7 +239,7 @@ def xen_image(build_dir):
     result = _run_bitbake(
         build_dir, "xen-image-minimal",
         extra_vars={
-            "DISTRO_FEATURES:append": " xen vxn virtualization vcontainer systemd",
+            "DISTRO_FEATURES:append": " xen vxn",
         },
     )
     if result.returncode != 0: