[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/292/ : SUCCESS in 1h 35m 56s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/285/ : SUCCESS in 4h 04m 24s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/285/ : UNSTABLE in 4h 50m 18s