[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/293/ : SUCCESS in 1h 34m 16s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/286/ : SUCCESS in 3h 32m 57s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/286/ : UNSTABLE in 3h 59m 48s