Travis CI On centos/systemd:latest Failed Due To CentOS 7.4 Released

[hswong3i]

Recent Travis CI build on centos/systemd:latest failed due to CentOS 7.4 released, where centos/systemd:latest is not yet update and still pointing to CentOS 7.3 version, causing yum -y update timeout with following error message:

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

This could only be fixed if:

• We manually run command as mentioned in https://hub.docker.com/r/centos/systemd/~/dockerfile/ during .travis.yml before_install section, or
• centos/systemd:latest updated and point to latest centos:7.4, or
• centos/systemd could provide tags as sync with centos as mentioned in centos/systemd: provide stable tags to released versions CentOS/CentOS-Dockerfiles#124

[hswong3i]

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