zabbix: always restart server when it crashed

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
zabbix: suggest other zabbix parts

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch 'master' of git://github.com/CleverCloud/CleverCloud-exheres

* 'master' of git://github.com/CleverCloud/CleverCloud-exheres:
  glusterfs: bump to 3.3.1
  haproxy: bump to 1.5-pre17