Fixed issue #23787 install script not working for RHEL7 host

Signed-off-by: Ken Cochrane <kencochrane@gmail.com>

hack/install.sh

@@ -243,7 +243,8 @@ do_install() {
 		lsb_dist='centos'
 	fi
 	if [ -z "$lsb_dist" ] && [ -r /etc/redhat-release ]; then
-		lsb_dist='redhat'
+		# we use centos for both redhat and centos releases
+		lsb_dist='centos'
 	fi
 	if [ -z "$lsb_dist" ] && [ -r /etc/os-release ]; then
 		lsb_dist="$(. /etc/os-release && echo "$ID")"