test/common: conditionally re-enable atime checks
The checks for modifying the access time via bolt_fs_touch
was previously disabled because it did not work on file-systems that have the noatime
flag set (for very obvious reasons). Separate these checks out and re-enable them but make their execution depended on the file-system support for access times, as reported via statvfs
(2).
@roberth any chance you could give this a quick go to see if that still works for you?