Use a role for configuring LDAP hostname on clients

This way it's also easy to converge all LDAP clients at once.

nodes/akkounts-1.json

@@ -78,8 +78,9 @@
     }
   },
   "run_list": [
-    "recipe[kosmos-base]",
+    "role[base]",
     "role[kvm_guest]",
+    "role[ldap_client]",
     "role[akkounts]"
   ]
-}
+}

nodes/ejabberd-4.json

@@ -59,8 +59,9 @@
     }
   },
   "run_list": [
-    "recipe[kosmos-base]",
+    "role[base]",
     "role[kvm_guest]",
+    "role[ldap_client]",
     "role[ejabberd]"
   ]
-}
+}

nodes/ejabberd-8.json

@@ -57,8 +57,9 @@
     }
   },
   "run_list": [
-    "recipe[kosmos-base]",
+    "role[base]",
     "role[kvm_guest]",
+    "role[ldap_client]",
     "role[ejabberd]"
   ]
 }

nodes/gitea-2.json

@@ -64,6 +64,7 @@
   "run_list": [
     "role[base]",
     "role[kvm_guest]",
+    "role[ldap_client]",
     "role[garage_gateway]",
     "role[gitea]"
   ]

nodes/wiki-1.json

@@ -74,8 +74,9 @@
     }
   },
   "run_list": [
-    "recipe[kosmos-base]",
+    "role[base]",
     "role[kvm_guest]",
+    "role[ldap_client]",
     "recipe[kosmos-mediawiki]"
   ]
-}
+}