PSYNC2: Create backlog on slave partial sync as well.
A slave may be started with an RDB file able to provide enough slave to perform a successful partial SYNC with its master. However in such a case, how outlined in issue #4268, the slave backlog will not be started, since it was only initialized on full syncs attempts. This creates different problems with successive PSYNC attempts that will always result in full synchronizations. Thanks to @fdingiit for discovering the issue.
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