[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/263/ : SUCCESS in 1h 39m 59s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/256/ : UNSTABLE in 2h 55m 26s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/256/ : UNSTABLE in 3h 54m 51s