Add a wait for availability of master server#1

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Sam-Martin wants to merge 6 commits intoActency:masterfrom

7digital:master

Commits on May 25, 2018

Commits on Jun 4, 2018

Added replication start delay
Sam-Martin
committed

Commits on Jun 8, 2018

Exposed SERVER_ID for manipulation with Environment Variables
Sam-Martin
committed
Removed initial replication check as the return code from the function was causing the container to exit
Sam-Martin
committed