~niedbalski/charms/trusty/swift-storage/backport-fix-lp1510666

Viewing all changes in revision 53.

[hopem,r=gnuoy]

Adds support for retrying ring fetch from broker.

As rings are updated on the broker, there will be
a small window where they are unavailable and wget
will return a 404. We will now retry a few times
before eventually failing.

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