Rewrite find calls to be robust against Input/output errors.
Rewrite find calls to be robust against Input/output errors.

In order to no falsely yield in a "purgedata" and/or "writeaccess" on errors:
- Limit find depth to not traverse deeper than necessary.
- Do not use negative logic via exec false and filter with grep.

tramseyer/meta-medusa-dist,tramseyer/meta-medusa-dist,tramseyer/meta-medusa-dist,tramseyer/meta-medusa-dist