We should not bailout when we get an error. We should continue
processing other files/directories. We were returning the
err passed in which was causing the processing to stop.
Fixes#30377
Issue #26093 identified pidof as one of the dependencies of kublet
which could be worked around. In this PR, we just look at /proc
to construct the list of pids we need for a specified process
instead of running "pidof" executable
Related to #26093
