Add a retry loop around apt-get and yum commands to overcome transient errors
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Key: WHIRR-517
URL: https://issues.apache.org/jira/browse/WHIRR-517
Project: Whirr
Issue Type: Improvement
Reporter: Karel Vervaeke
Often, installation on one or more nodes fails because of transient errors
(mostly failed connection attempts).
Therefore we should make use of command's built-in retry options and/or add our
own retry loops.
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