Adding delay in postgresql upgrade process
requested to merge 1785-pg-upgrade-should-have-a-wait-time-before-it-starts-the-procedure into master
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Give user a chance to change their mind
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Give instance a chance to finish up any running tasks
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Can be avoided with -w or --no-wait option
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Also, rename file to pg-upgrade to closer specify its intention
Closes #1785 (closed)