component/haproxy: version up 2.7.2

component/haproxy/buildout.cfg

 # HAProxy - The Reliable, High Performance TCP/HTTP Load Balancer
-# http://haproxy.1wt.eu/
+# https://www.haproxy.org/
 
 [buildout]
 extends =
@@ -13,8 +13,8 @@ parts = haproxy
 [haproxy]
 recipe = slapos.recipe.cmmi
 shared = true
-url = https://www.haproxy.org/download/2.6/src/haproxy-2.6.8.tar.gz
-md5sum = 0b506378f1ade633d5b921f5806a5e82
+url = https://www.haproxy.org/download/2.7/src/haproxy-2.7.2.tar.gz
+md5sum = 0b6e16bbc45cb65e7d5b43d6ed1ff071
 configure-command = true
 # for Linux kernel 2.6.28 and above, we use "linux-glibc" as the TARGET,
 # otherwise use "generic".