[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/268/ : SUCCESS in 1h 45m 51s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/261/ : SUCCESS in 3h 44m 40s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/261/ : UNSTABLE in 3h 05m 55s