pkgtest: try to shutdown a previous runned LXC if found before start tests
pkgtest: try to shutdown a previous runned LXC if found before start tests

Former-commit-id: 95be9761bc343359f16a2b94887e6d12ffde3a3c [formerly 26c7c0c098aca3046bbb6071fe2f906313e56518]
Former-commit-id: c847779acb7801934159b0011f2b412d48f5b72e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine