kola/tests: fix writable dirs and files tests
kola/tests: fix writable dirs and files tests

These shouldn't be recursing into the rkt containers.

dm0-/mantle,glevand/coreos--mantle,quantum/coreos-mantle,marineam/mantle,marineam/mantle,quantum/coreos-mantle,glevand/coreos--mantle,dm0-/mantle