Round estimatedCost in some tests (#9126)
Round estimatedCost in some tests (#9126)

Otherise slightly different floating point results in estimatedCosts cause
tests to fail.
fceller/arangodb,graetzer/arangodb,fceller/arangodb,wiltonlazary/arangodb,fceller/arangodb,graetzer/arangodb,Simran-B/arangodb,arangodb/arangodb,fceller/arangodb,fceller/arangodb,wiltonlazary/arangodb,graetzer/arangodb,Simran-B/arangodb,Simran-B/arangodb,arangodb/arangodb,Simran-B/arangodb,arangodb/arangodb,graetzer/arangodb,Simran-B/arangodb,fceller/arangodb,graetzer/arangodb,arangodb/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,graetzer/arangodb,graetzer/arangodb,Simran-B/arangodb,graetzer/arangodb,Simran-B/arangodb,fceller/arangodb,arangodb/arangodb,fceller/arangodb,wiltonlazary/arangodb,wiltonlazary/arangodb,fceller/arangodb,Simran-B/arangodb,wiltonlazary/arangodb,graetzer/arangodb,arangodb/arangodb,graetzer/arangodb,arangodb/arangodb,fceller/arangodb,arangodb/arangodb,wiltonlazary/arangodb,graetzer/arangodb,wiltonlazary/arangodb,graetzer/arangodb,wiltonlazary/arangodb,Simran-B/arangodb