component/haproxy: Version up 2.0.20

90 bugs fixed since 2.0.17:

 * 6 major
 * 30 medium
 * 54 minor

See http://www.haproxy.org/bugs/bugs-2.0.17.html

component/haproxy/buildout.cfg

@@ -13,8 +13,8 @@ parts = haproxy
 [haproxy]
 recipe = slapos.recipe.cmmi
 shared = true
-url = http://www.haproxy.org/download/2.0/src/haproxy-2.0.17.tar.gz
-md5sum = 786a967c73cc1455c938d42fbe333bfe
+url = http://www.haproxy.org/download/2.0/src/haproxy-2.0.20.tar.gz
+md5sum = 9f85ea9e6fd7d49a11cdc4c6269e10dd
 configure-command = true
 # for Linux kernel 2.6.28 and above, we use "linux-glibc" as the TARGET,
 # otherwise use "generic".