[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/228/ : SUCCESS in 1h 37m 37s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/221/ : SUCCESS in 4h 01m 56s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/220/ : UNSTABLE in 3h 02m 14s