NPD: catch hung task with pattern "task [\\S\s]+"

Some of the hung tasks are not caught, which are of the pattern
"task airflow schedule:*"
BUG=b/169432363
TEST=emerge-lakitu node-problem-detector
RELEASE_NOTE= Upgraded node-problem-detector to identify HungTasks

Change-Id: I3e0439799dac03d5c72f6908e73d91db71588f70
2 files changed