Build timeouts after ccache added

[lebeg]

Some rare build failures occur after the addition of ccache. Sample:

http://jenkins.mxnet-ci.amazon-ml.com/blue/rest/organizations/jenkins/pipelines/incubator-mxnet/branches/PR-11486/runs/1/nodes/57/log/?start=0

http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/incubator-mxnet/detail/PR-11486/1/pipeline/

The builds are hitting the Jenkin's timeout as the task fails at exactly the 2h mark.

The machine will probably have a running container until it's down-scaled due to the zombie container bug.

Adding build retries and lowering the Jenkins build timeout should improve the situation.

[andrewfayres]

@sandeep-krishnamurthy requesting this be CI

[szha]

@marcoabreu you're probably interested.

[lebeg]

Zombie container issue has been resolved with #12381. Retries had been added with #11877. Issue should be resolved.