FAB-11377 fix docker-clean failed
FAB-11377 fix docker-clean failed

Use "xargs -r docker rmi -f" instead of "xargs docker rmi -f" to fix issue.

Change-Id: I40601063e195fd75863a5f3d22bdf47f1d8497b9
Signed-off-by: bai fudong <1533956280d6a887ffb873d9c09fe3b59c07cc2d@qq.com>

hyperledger/fabric,stemlending/fabric,muralisrini/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,xixuejia/fabric,jimthematrix/fabric,manish-sethi/fabric,binhn/fabric,stemlending/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,manish-sethi/fabric-sidedb,binhn/fabric,xixuejia/fabric,muralisrini/fabric,binhn/fabric,xixuejia/fabric