Fixed bug when only one key is returned during ls().

Instead of placing it in response::value it should be placed in
reponse::values

src/Response.cpp

@@ -10,7 +10,7 @@ etcd::Response::Response(const etcdv3::V3Response& reply)
   _error_message = reply.error_message;
   _action = reply.action;
   int size = reply.values.size();
-  if(size > 1)
+  if(reply.isPrefix)
   {
     for(int index = 0; index < size; index++)
     {

tst/EtcdTest.cpp

@@ -189,10 +189,16 @@ TEST_CASE("list a directory")
   CHECK(0 == etcd.ls("/test/new_dir").get().keys().size());
 
   etcd.set("/test/new_dir/key1", "value1").wait();
+  etcd::Response resp = etcd.ls("/test/new_dir").get();
+  CHECK("get" == resp.action());
+  REQUIRE(1 == resp.keys().size());
+  CHECK("/test/new_dir/key1" == resp.key(0));
+  CHECK("value1" == resp.value(0).as_string());
+
   etcd.set("/test/new_dir/key2", "value2").wait();
   etcd.set("/test/new_dir/sub_dir", "value3").wait();
 
-  etcd::Response resp = etcd.ls("/test/new_dir").get();
+  resp = etcd.ls("/test/new_dir").get();
   CHECK("get" == resp.action());
   REQUIRE(3 == resp.keys().size());
   CHECK("/test/new_dir/key1" == resp.key(0));

v3/include/AsyncGetAction.hpp

@@ -20,6 +20,7 @@ namespace etcdv3
       AsyncRangeResponse ParseResponse();
       RangeResponse reply;
       std::unique_ptr<ClientAsyncResponseReader<RangeResponse>> response_reader;
+      bool prefix;
   };
 }
 

v3/include/V3Response.hpp

@@ -9,9 +9,10 @@ namespace etcdv3
   class V3Response
   {
     public:
-    V3Response(): error_code(0), index(0) {};
+    V3Response(): error_code(0), index(0), isPrefix(false) {};
     int error_code;
     int index;
+    bool isPrefix;
     std::string error_message;
     std::string action;
     std::vector<mvccpb::KeyValue> values;

v3/src/AsyncGetAction.cpp

@@ -9,6 +9,7 @@ etcdv3::AsyncGetAction::AsyncGetAction(std::string const & key, KV::Stub* stub_,
   get_request.set_key(key);
   if(withPrefix)
   {
+    prefix = withPrefix;
     std::string range_end(key); 
     int ascii = (int)range_end[range_end.length()-1];
     range_end.back() = ascii+1;
@@ -35,6 +36,7 @@ etcdv3::AsyncRangeResponse etcdv3::AsyncGetAction::ParseResponse()
   { 
     range_resp.ParseResponse();
     range_resp.action = etcdv3::GET_ACTION;
+    range_resp.isPrefix = prefix;
   }
     
   return range_resp;