Add dir needed for chroot to spec

Haproxy can now be started in chroot by adding "chroot
/var/lib/haproxy" to global config section. Without having to manually
create the directory.
add haproxy support ssl
Parameterize release number

When building rpm its often handy to be able to pass in release number
(aka build number) as a paremeter rather than have to modify the spec
file. This is often done with build systems such as jenkins.