[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/291/ : SUCCESS in 1h 35m 34s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/284/ : SUCCESS in 3h 44m 28s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/284/ : UNSTABLE in 3h 43m 43s