Add imap and smtp subdomains to mail server cert

closes #543

Co-authored-by: Greg Karékinian <greg@karekinian.com>

site-cookbooks/kosmos_email/recipes/default.rb

@@ -7,6 +7,7 @@ domain   = node["email"]["domain"]
 hostname = node["email"]["hostname"]
 root_dir = node["email"]["root_directory"]
 ip_addr  = node["knife_zero"]["host"]
+extra_hostnames = ["smtp.#{domain}", "imap.#{domain}"]
 
 node.override["set_fqdn"] = hostname
 include_recipe "hostname"
@@ -23,6 +24,7 @@ directory root_dir do
 end
 
 tls_cert_for hostname do
+  domain ([hostname]+extra_hostnames)
   auth "gandi_dns"
   action :create
 end