[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/255/ : SUCCESS in 1h 43m 43s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/248/ : SUCCESS in 3h 05m 09s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/248/ : UNSTABLE in 3h 05m 54s