[util] more information on fault injection
[util] more information on fault injection

Log more information on injected fault: name of the process and PID.
That helps to parse concatenated logs: e.g., that useful in parsing
logs from scenarios run via dist-test.

Change-Id: Id0f094006a89fd271091d1bde13d301ea359ae61
Reviewed-on: http://gerrit.cloudera.org:8080/11960
Tested-by: Kudu Jenkins
Reviewed-by: Will Berkeley <c74686ab413a71926fc1bc9d16ebfa30e619336a@gmail.com>

InspurUSA/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,helifu/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,InspurUSA/kudu,helifu/kudu,helifu/kudu