fix image size test

Author: hendolim

Makefile

@@ -409,7 +409,7 @@ CUR_SIZE=$$(docker image inspect $1:latest --format='{{.Size}}') ; \
 EDGE_SIZE=$$(docker image inspect splunk/splunk:edge --format='{{.Size}}') ; \
 echo "current $1 image size = "$$CUR_SIZE ; \
 echo "edge image size = "$$EDGE_SIZE ; \
-if [[ $$CUR_SIZE > $$EDGE_SIZE*1.01 ]] ; then echo "current image size is 10% more than edge image" ; exit 1 ; fi
+if [[ $$CUR_SIZE -gt $$EDGE_SIZE*102/100 ]] ; then echo "current image size is 2% more than edge image" ; exit 1 ; fi
 endef
 
 setup_clair_scanner: