[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/286/ : SUCCESS in 1h 35m 31s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/279/ : SUCCESS in 3h 50m 03s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/279/ : UNSTABLE in 4h 20m 29s