Handle non-readable files better in doCopyFileOrDir

Currently a non-readable file causes an exception and resulting
error logging as the path is passed blindly to archive.add_file().
There are legitimate reasons why directories colleceted by sos may
contain files not readable by root, e.g. in sysfs where there are
numerous write-only trigger files.

Check the permissions via os.stat() before reading the file and
substitute unreadable files with the empty string.

0 files changed, 0 insertions, 0 deletions