Fix compilation issues.

Author: vietj

vertx-web-client/src/test/java/io/vertx/ext/web/client/tests/WebClientTest.java

@@ -2291,7 +2291,7 @@ public Future<Boolean> updateSSLOptions(ClientSSLOptions options, boolean force)
     @Override public HttpClientOptions options(){return new HttpClientOptions();}
     @Override public NetClientInternal netClient(){return null;}
     @Override public Future<Void> closeFuture(){return null;}
-    @Override public void close(Promise<Void> completion){}
+    @Override public void close(Completable<Void> completion){}
     @Override public Future<HttpClientRequest> request(RequestOptions options){return null;}
     @Override public Future<Void> shutdown(long timeout, TimeUnit unit){return null;}
     @Override public Metrics getMetrics(){return null;}

vertx-web-session-stores/vertx-web-sstore-caffeine/src/main/java/io/vertx/ext/web/sstore/caffeine/impl/CaffeineSessionStoreImpl.java

@@ -4,10 +4,7 @@
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.Expiry;
 import io.vertx.codegen.annotations.Nullable;
-import io.vertx.core.Closeable;
-import io.vertx.core.Future;
-import io.vertx.core.Promise;
-import io.vertx.core.Vertx;
+import io.vertx.core.*;
 import io.vertx.core.internal.CloseFuture;
 import io.vertx.core.internal.ContextInternal;
 import io.vertx.core.internal.VertxInternal;
@@ -67,7 +64,7 @@ public SessionStore init(Vertx vertx, JsonObject options) {
         .expireAfter(Expiry.accessing((String key, Session session) ->
           Duration.ofMillis(session.timeout())))
         .build();
-      cf_.add(Promise::complete);
+      cf_.add(Completable::succeed);
       return localCaffeineCache;
     });
     closeable = closeFuture;

vertx-web/src/test/java/io/vertx/ext/web/tests/handler/SlowClusterEventbusBridgeTest.java

@@ -11,6 +11,7 @@
 
 package io.vertx.ext.web.tests.handler;
 
+import io.vertx.core.Completable;
 import io.vertx.core.Promise;
 import io.vertx.core.Vertx;
 import io.vertx.core.http.*;
@@ -177,7 +178,7 @@ private static class SlowClusterManager extends WrappedClusterManager {
     }
 
     @Override
-    public void addRegistration(String address, RegistrationInfo registrationInfo, Promise<Void> promise) {
+    public void addRegistration(String address, RegistrationInfo registrationInfo, Completable<Void> promise) {
       vertx.setTimer(1000, l -> {
         super.addRegistration(address, registrationInfo, promise);
       });