Pre-failover tasks for Pages

Firstly, I invite anyone to note anything I forget. The following needs to be done before a failover.

~~one more rsync~~ moved to failover checklist: !7 (merged)
data verification (needs to be determined what that would entail): #388 (closed)
~~failover~~ moved to failover checklist: !7 (merged)
Related: Use Azure HAProxy instances to route Pages data from old Pages IP in Azure to new Pages instance in GCP: #159 (closed)

Do note, however that the rsync does take a while, even if it has little to transfer. As such, we should determine the best way to ensure the files are in sync up after the failover.

Edited May 09, 2018 by Andrew Newdigate

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