Merge pull request #8944 from 0xc0170/dev_test_travis

Travis fix: rabbitmq key update (travis msg broker)

Author: 0xc0170

.travis.yml

@@ -30,8 +30,8 @@ before_install:
   # Setup ppa to make sure arm-none-eabi-gcc is correct version
   - sudo add-apt-repository -y ppa:team-gcc-arm-embedded/ppa
   - sudo add-apt-repository -y ppa:deadsnakes/ppa
-  # Fix for "The following signatures were invalid: KEYEXPIRED 1515625755" failed". See https://github.com/travis-ci/travis-ci/issues/9037
-  - sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6
+  # import the new keys for rabbitmq (fix for https://github.com/ARMmbed/mbed-os/issues/8945)
+  - curl -s https://packagecloud.io/install/repositories/rabbitmq/rabbitmq-server/script.deb.sh | sudo bash
   # Loop until update succeeds (timeouts can occur)
   - travis_retry $(! sudo apt-get update 2>&1 |grep Failed)