fix oracle linux install

Signed-off-by: Jessica Frazelle <acidburn@docker.com>

hack/install.sh

@@ -198,11 +198,11 @@ do_install() {
 		oracleserver)
 			# need to switch lsb_dist to match yum repo URL
 			lsb_dist="oraclelinux"
-			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//')"
+			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//')"
 		;;
 
 		fedora|centos)
-			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//')"
+			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//')"
 		;;
 
 		*)