RUBY-1070 Update RSOther SDAM test

Author: estolfo

lib/mongo/server/description.rb

@@ -364,7 +364,8 @@ def mongos?
       #
       # @since 2.0.0
       def other?
-        !primary? && !secondary? && !passive? && !arbiter?
+        (!primary? && !secondary? && !passive? && !arbiter?) ||
+          (hidden? && !replica_set_name.nil?)
       end
 
       # Will return true if the server is passive.

spec/support/sdam/rs/rsother_discovered.yml

@@ -7,12 +7,21 @@ phases: [
     {
         responses: [
 
+                ["a:27017", {
+
+                    ok: 1,
+                    ismaster: false,
+                    secondary: true,
+                    hidden: true,
+                    hosts: ["c:27017", "d:27017"],
+                    setName: "rs"
+                }],
                 ["b:27017", {
 
                     ok: 1,
                     ismaster: false,
                     secondary: false,
-                    hosts: ["a:27017", "b:27017"],
+                    hosts: ["c:27017", "d:27017"],
                     setName: "rs"
                 }]
         ],
@@ -23,14 +32,26 @@ phases: [
 
                 "a:27017": {
 
-                    type: "Unknown",
-                    setName:
+                    type: "RSOther",
+                    setName: "rs"
                 },
 
                 "b:27017": {
 
                     type: "RSOther",
                     setName: "rs"
+                },
+
+                "c:27017": {
+
+                    type: "Unknown",
+                    setName: 
+                },
+
+                "d:27017": {
+
+                    type: "Unknown",
+                    setName: 
                 }
             },