[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/301/ : SUCCESS in 1h 55m 34s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/294/ : SUCCESS in 2h 56m 46s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/294/ : UNSTABLE in 3h 57m 49s