Add validation for the Logging Directory setting.

Review Request #1086 — Created Sept. 22, 2009 and submitted

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Review Board
master
893

Reviewers

Add validation for the Logging Directory setting.

This change introduces validation for the Logging Directory setting. We
check the existance of the path, whether or not it's actually a directory,
and whether or not the web server can write to it.
Tested each of the conditions that we now check for. Saw the expected errors.