Cleanup haproxy.cfg

* /run/haproxy.pid is not used
* seamless reload is not functional and causes a warning at startup: "[WARNING] 213/153256 (1) : Can't open server state file '/var/lib/haproxy/server-state': No such file or directory"

haproxy.cfg

@@ -1,12 +1,7 @@
 global
     log stdout format raw daemon "${LOG_LEVEL}"
-
-    pidfile /run/haproxy.pid
     maxconn 4000
 
-    # Turn on stats unix socket
-    server-state-file /var/lib/haproxy/server-state
-
 defaults
     mode http
     log global
@@ -24,9 +19,6 @@ defaults
     timeout check 10s
     maxconn 3000
 
-    # Allow seamless reloads
-    load-server-state-from-file global
-
     # Use provided example error pages
     errorfile 400 /usr/local/etc/haproxy/errors/400.http
     errorfile 403 /usr/local/etc/haproxy/errors/403.http