check_disk_space: handle relative log_directory path #174
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If the log_directory resolves to a relative path,
e.g. "../pg_log", the check_disk_space fails with an error like:
ERROR: Invalid result from command "/bin/df -kP "../pg_log" 2>&1": /bin/df: â: No such file or directory
This patch adds a verification to check if the logdir variable starts with a .[dot]