tests: call search_pool_containing_dir with various dirs and pools
tests: call search_pool_containing_dir with various dirs and pools

QubesOS/qubes-issues#3241

QubesOS/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin