Recommended update for acl

This update for acl fixes the following issues:

- test: Add helper library to fake passwd/group files.
- quote: Escape literal backslashes. (bsc#953659)

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#953659
setfacl gets confused if the userid is all numbers
Selected Binaries
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