[test-results] Stable check of asterisk failed

[asteriskteam at digium.com]

Build failed.

- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-11/264/ : SUCCESS in 1h 43m 27s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-13/257/ : SUCCESS in 3h 02m 27s
- https://jenkins.asterisk.org/jenkins/job/periodic-asterisk-master/257/ : UNSTABLE in 3h 54m 57s