Redmine #4312: Fix incorrect file location for backup repository.

Canonifying and appending the file name was done twice, so the fix
was simply to remove the first pass.
Merge pull request #1654 from kacfengine/repository_file_location

Redmine #4312: Fix incorrect file location for backup repository.
Move new test into staging as long as it fails in build pipeline.

The test passes in a local run, so not reverting the change otherwise.
tests/unit: fix file_writer test on Mac OS X (Darwin) because of clang
Merge pull request #1659 from tzz/fix-darwin-unit-tests

tests/unit: fix file_writer test on Mac OS X (Darwin) because of clang
10_files/02_maintain/backup_repository.cf: try enabling again
Merge pull request #1660 from tzz/test/fix-backup-repository-test

10_files/02_maintain/backup_repository.cf: try enabling again