Add a retry loop around apt-get and yum commands to overcome transient errors
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Key: WHIRR-528
URL: https://issues.apache.org/jira/browse/WHIRR-528
Project: Whirr
Issue Type: Improvement
Reporter: Andrei Savu
Fix For: 0.8.0
We've done something like this already in WHIRR-517 for 0.7.1 (hotfix release).
We need to do the same for trunk but also refactor the code to avoid code
duplication.
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