tests: allow to load kernel modules from a test container

CRIU needs to load a few modules to checkpoint/resume containers.

opencontainers#1745
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Dockerfile

@@ -20,6 +20,7 @@ RUN apt-get update && apt-get install -y \
     protobuf-compiler \
     python-minimal \
     uidmap \
+    kmod \
     --no-install-recommends \
     && apt-get clean
 

Makefile

@@ -65,13 +65,13 @@ localtest:
 	make localunittest localintegration localrootlessintegration
 
 unittest: runcimage
-	docker run -e TESTFLAGS -t --privileged --rm -v $(CURDIR):/go/src/$(PROJECT) $(RUNC_IMAGE) make localunittest
+	docker run -e TESTFLAGS -t --privileged --rm -v /lib/modules -v $(CURDIR):/go/src/$(PROJECT) $(RUNC_IMAGE) make localunittest
 
 localunittest: all
 	$(GO) test -timeout 3m -tags "$(BUILDTAGS)" ${TESTFLAGS} -v $(allpackages)
 
 integration: runcimage
-	docker run -e TESTFLAGS -t --privileged --rm -v $(CURDIR):/go/src/$(PROJECT) $(RUNC_IMAGE) make localintegration
+	docker run -e TESTFLAGS -t --privileged --rm -v /lib/modules -v $(CURDIR):/go/src/$(PROJECT) $(RUNC_IMAGE) make localintegration
 
 localintegration: all
 	bats -t tests/integration${TESTFLAGS}