Werk #6973: fileinfo: Fixed various bugs.

• If you only had fileinfo config files below fileinfo.d/, but not fileinfo.cfg, the former ones were ignored.
• Spaces in the paths to the config files and within the patterns itself did not work.
• Brace expansion and tilde expansion in patterns did not work.
• The config files can now contain comment lines in the usual syntax, i.e. lines starting with some optional whitespace, optionally followed by a hash mark and a comment.
• Date variables work in all agents now.

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