new(userspace/libsinsp): support lxc 4.0 cgroup layout. #6001

Job	Run time
build-libs-linux-amd64-static 🎃	26m 45s
build-shared-libs-linux-amd64 🧐	4m 46s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	6m 57s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	6m 15s
build-libs-others-amd64 😨 (macos-latest)	6m 53s
build-libs-emscripten 🧐	4m 23s
build-libs-linux-amd64 😁 (system_deps)	6m 21s
build-shared-libs-macos-amd64 😨	1m 42s
build-libs-linux-amd64 😁 (bundled_deps)	17m 58s
run-e2e-tests-amd64 (system_deps)	8m 51s
test-libs-static (bundled_deps)	15m 10s
build-libs-linux-amd64 😁 (system_deps_minimal)	4m 31s
run-e2e-tests-amd64 (bundled_deps)	20m 36s
run-e2e-tests-amd64 (asan)	21m 57s
build-libs-linux-amd64 😁 (sanitizers)	14m 39s
build-libs-linux-arm64 😁 (system_deps)	6m 22s
build-libs-linux-arm64 😁 (bundled_deps)	18m 24s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 46s
build-libs-linux-arm64 😁 (sanitizers)	17m 10s
	3h 34m 26s

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