storage: Use background ctx when rerunning replica consistency check
storage: Use background ctx when rerunning replica consistency check

We were previously using a context that got cancelled shortly after
creating the async task, meaning that the async task never really got a
chance to complete successfully.

maxlang/cockroach,paperstreet/cockroach,paperstreet/cockroach,veteranlu/cockroach,veteranlu/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,maxlang/cockroach,petermattis/cockroach,veteranlu/cockroach,glycerine/cockroach,paperstreet/cockroach,maxlang/cockroach,glycerine/cockroach,maxlang/cockroach,petermattis/cockroach,veteranlu/cockroach,paperstreet/cockroach,veteranlu/cockroach,maxlang/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,petermattis/cockroach,maxlang/cockroach,vaibhavarora/cockroach,glycerine/cockroach,veteranlu/cockroach,petermattis/cockroach,paperstreet/cockroach,glycerine/cockroach,petermattis/cockroach,glycerine/cockroach,veteranlu/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,maxlang/cockroach,glycerine/cockroach,petermattis/cockroach,paperstreet/cockroach,petermattis/cockroach,vaibhavarora/cockroach,glycerine/cockroach,vaibhavarora/cockroach,maxlang/cockroach,petermattis/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,glycerine/cockroach