sieve_test: loosen timing so that tests pass even on a busy machine
sieve_test: loosen timing so that tests pass even on a busy machine

Signed-off-by: Simon Schubert <51a3d642c59e957126c8c9975e756dadd0226d4c@zurich.ibm.com>

angrbrd/fabric,murali-katipalli-dtcc/fabric,hyperledger-archives/fabric,gennadylaventman/fabric,JonathanLevi/fabric,murali-katipalli-dtcc/fabric,jjjjibm/fabric,gennadylaventman/fabric,ahuachen/fabric,popldo/fabric,gongsu832/fabric,JonathanLevi/fabric,popldo/fabric,ahuachen/fabric,isghe/obc-peer,gromeroar/fabric,bren3582/fabric,srderson/fabric,srderson/fabric,tuand27613/fabric,itp4IBM/fabric,jjjjibm/fabric,gongsu832/obc-peer,noamher/obc-peer,ghaskins/obc-peer,angrbrd/fabric,rameshthoomu/obc-peer,ahuachen/fabric,tuand27613/fabric,tuand27613/fabric,bren3582/fabric,hyperledger-archives/fabric,itp4IBM/fabric,murali-katipalli-dtcc/fabric,tuand27613/obc-peer,tuand27613/fabric,bburgdave/fabric,gromeroar/fabric,jjjjibm/fabric,ghaskins/obc-peer,gromeroar/fabric,andresgaragiola/fabric,bburgdave/fabric,adecaro/fabric,binhn/obc-peer,noamher/obc-peer,adecaro/fabric,ghaskins/obc-peer,murali-katipalli-dtcc/fabric,bren3582/fabric,angrbrd/fabric,andresgaragiola/fabric,bren3582/fabric,sumanair/obc-peer,itp4IBM/fabric,gongsu832/fabric,murali-katipalli-dtcc/fabric,JonathanLevi/fabric,JonathanLevi/fabric,ariccy/fabric,ariccy/fabric,tuand27613/fabric,adecaro/fabric,srderson/fabric,hyperledger-archives/fabric,gromeroar/fabric,jjjjibm/fabric,gongsu832/obc-peer,hyperledger-archives/fabric,angrbrd/fabric,ahuachen/fabric,bren3582/fabric,ariccy/fabric,andresgaragiola/fabric,gongsu832/obc-peer,JonathanLevi/fabric,tenc/obc-peer-pre-public,gongsu832/fabric,murali-katipalli-dtcc/fabric,popldo/fabric,hyperledger-archives/fabric,popldo/fabric,ariccy/fabric,gromeroar/fabric,adecaro/fabric,rameshthoomu/obc-peer,gennadylaventman/fabric,ariccy/fabric,tuand27613/obc-peer,adecaro/fabric,binhn/obc-peer,isghe/obc-peer,tenc/obc-peer-pre-public,jjjjibm/fabric,openblockchain/obc-peer,srderson/fabric,isghe/obc-peer,bburgdave/fabric,noamher/obc-peer,ahuachen/fabric,isghe/obc-peer,gromeroar/fabric,jjjjibm/fabric,JonathanLevi/fabric,popldo/fabric,angrbrd/fabric,srderson/fabric,ariccy/fabric,gromeroar/fabric,angrbrd/fabric,andresgaragiola/fabric,popldo/fabric,tuand27613/fabric,tenc/obc-peer-pre-public,angrbrd/fabric,ghaskins/obc-peer,adecaro/fabric,ariccy/fabric,ahuachen/fabric,popldo/fabric,gennadylaventman/fabric,hyperledger-archives/fabric,gennadylaventman/fabric,rameshthoomu/obc-peer,gennadylaventman/fabric,tuand27613/obc-peer,adecaro/fabric,andresgaragiola/fabric,jjjjibm/fabric,itp4IBM/fabric,isghe/obc-peer,hyperledger-archives/fabric,srderson/fabric,openblockchain/obc-peer,gongsu832/fabric,bburgdave/fabric,bren3582/fabric,binhn/obc-peer,gennadylaventman/fabric,sumanair/obc-peer,openblockchain/obc-peer,itp4IBM/fabric,bburgdave/fabric,bren3582/fabric,JonathanLevi/fabric,andresgaragiola/fabric,srderson/fabric,tenc/obc-peer-pre-public,ahuachen/fabric,itp4IBM/fabric,tuand27613/fabric,murali-katipalli-dtcc/fabric,sumanair/obc-peer,andresgaragiola/fabric,itp4IBM/fabric