This patch enables 3 new configuration options for haproxy.cfg
global section.

  - haproxy_processes: number of haproxy processes (default:1).
  - haproxy_max_connections: number of concurrent connections (default:4000)
  - haproxy_process_cpu_map: enforces 1:1 mapping/affinity between
process and core. (default: no).

Closes-Bug: #1770060
Change-Id: I33fc499b083c7bcc548133498e44406a479389f1
Signed-off-by: Jorge Niedbalski <jorge.niedbalski@linaro.org>