Improve clean_path function
Improve clean_path function

It now handles paths like '/' or '/usr/../tmp'

Signed-off-by: Felix Abecassis <55aebb135999a2c3fc3e3a88716154833ef9e5ed@nvidia.com>

Trophime/singularity,Trophime/singularity,Trophime/singularity,Trophime/singularity