SERVER-24058 make connpool asio use setup timeouts

We were ignoring passed setup timeouts, which caused connection acquisition to hang forever in
connect if the other side didn't accept or refuse a connection.

jstests/sharding/startup_with_all_configs_down.js

@@ -56,7 +56,9 @@
     var error = assert.throws(function() {
         st.s.getDB('test').foo.find().itcount();
     });
-    assert.eq(ErrorCodes.ExceededTimeLimit, error.code);
+
+    assert(ErrorCodes.ReplicaSetNotFound == error.code ||
+           ErrorCodes.ExceededTimeLimit == error.code || ErrorCodes.HostUnreachable == error.code);
 
     jsTestLog("Restarting the config servers");
     for (var i = 0; i < st._configServers.length; i++) {

src/mongo/executor/async_stream_common.h

@@ -76,7 +76,6 @@ void readStream(ASIOStream* stream,
 
 template <typename ASIOStream>
 void cancelStream(ASIOStream* stream, bool connected) {
-    invariant(connected);
     stream->cancel();
 }
 

src/mongo/executor/connection_pool_asio.cpp

@@ -185,7 +185,13 @@ void ASIOConnection::cancelTimeout() {
 
 void ASIOConnection::setup(Milliseconds timeout, SetupCallback cb) {
     _impl->strand().dispatch([this, timeout, cb] {
-        _setupCallback = std::move(cb);
+        _setupCallback = [this, cb](ConnectionInterface* ptr, Status status) {
+            cancelTimeout();
+            cb(ptr, status);
+        };
+
+        // Actually timeout setup
+        setTimeout(timeout, [this] { _impl->connection().stream().cancel(); });
 
         _global->_impl->_connect(_impl.get());
     });
@@ -202,7 +208,7 @@ void ASIOConnection::refresh(Milliseconds timeout, RefreshCallback cb) {
         _refreshCallback = std::move(cb);
 
         // Actually timeout refreshes
-        setTimeout(timeout, [this]() { _impl->connection().stream().cancel(); });
+        setTimeout(timeout, [this] { _impl->connection().stream().cancel(); });
 
         // Our pings are isMaster's
         auto beginStatus = op->beginCommand(makeIsMasterRequest(this),