Bug 1189: Suppress duplicated path fault log.

An error log which indicates a path fault should not be recorded
if it is already detected.

Change-Id: Icdf81c0677742268b52146953ec69e34015c9c5f
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>
Merge "Bug 1189: Suppress duplicated path fault log."