component/haproxy: Version up from 2.0 to 2.6

2.6 implementes url normalization, needed on front facing part, see
https://cbonte.github.io/haproxy-dconv/2.6/configuration.html#4.2-http-request%20normalize-uri

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-2.0.29.tar.gz
-md5sum = a4c4983c7ed51946bdde1d0eceedd527
+url = http://www.haproxy.org/download/2.6/src/haproxy-2.6.7.tar.gz
+md5sum = cfa36413f2bc5187ab34ffcdf71914d4
 configure-command = true
 # for Linux kernel 2.6.28 and above, we use "linux-glibc" as the TARGET,
 # otherwise use "generic".