.cirrus.yum: retry yum if failed
.cirrus.yum: retry yum if failed

Add a sleep + retry loop in case yum install has failed.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

rhatdan/runc,kolyshkin/runc,dqminh/runc,dqminh/runc,kolyshkin/runc,kolyshkin/runc,dqminh/runc,opencontainers/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,kolyshkin/runc,opencontainers/runc,dqminh/runc,opencontainers/runc,rhatdan/runc