Add exists_ok to mkdir

Cherry picked results from !905 (merged):

• Add the exist_ok=True flag to mkdirs resolving errors caused when the directory is created before it is written (common on large-scale HTC runs).

changed milestone to %1.1.2

added 3 commits

• 06546791...fef914d0 - 2 commits from branch master
• 58129ac1 - Merge branch 'master' into utils-improvement

Compare with previous version

resolved all threads

resolved all threads

added 1 commit

• ba1d0011 - Apply 1 suggestion(s) to 1 file(s)

Compare with previous version

approved this merge request

approved this merge request

added Utility functions label

merged

mentioned in commit a02c9c57