kola/tests/misc: add a test to find broken symbolic links
kola/tests/misc: add a test to find broken symbolic links

This only checks the ROOT and USR partitions for now.

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