Speedup retrieving inputstream

Workd both on sending and retrieving (server, client) an InputStream

Fetch more than 1 at startup (3 to still have a limit of memory
consumption)

Speedup:
- POST: from 900 MB/s to 1200 MB/s (almost close to Netty native Post
  at 1400 MB/s)
- GET: from 900 MB/s to 2000 MB/s (still half og Netty netive GET at
  4400 MB/s)

extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/VertxInputStream.java

@@ -226,7 +226,8 @@ public void handle(Throwable event) {
                         }
 
                     });
-                    request.fetch(1);
+                    // More than 1 speedup retrieve while limited in memory
+                    request.fetch(3);
                 } else {
                     eof = true;
                 }
@@ -266,10 +267,8 @@ protected ByteBuf readBlocking() throws IOException {
                 input1 = null;
                 if (inputOverflow != null) {
                     input1 = inputOverflow.poll();
-                    if (input1 == null) {
-                        request.fetch(1);
-                    }
-                } else if (!eof) {
+                }
+                if (!eof) {
                     request.fetch(1);
                 }
                 return ret == null ? null : ret.getByteBuf();

independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/handlers/VertxClientInputStream.java

@@ -181,7 +181,8 @@ public void handle(Throwable event) {
                     }
 
                 });
-                response.fetch(1);
+                // More than 1 speedup retrieve while limited in memory
+                response.fetch(3);
             } catch (IllegalStateException e) {
                 //already ended
                 eof = true;
@@ -221,10 +222,8 @@ protected ByteBuf readBlocking() throws IOException {
                 input1 = null;
                 if (inputOverflow != null) {
                     input1 = inputOverflow.poll();
-                    if (input1 == null) {
-                        request.fetch(1);
-                    }
-                } else if (!eof) {
+                }
+                if (!eof) {
                     request.fetch(1);
                 }
                 return ret == null ? null : ret.getByteBuf();

independent-projects/resteasy-reactive/server/vertx/src/main/java/org/jboss/resteasy/reactive/server/vertx/VertxInputStream.java

@@ -227,7 +227,8 @@ public void handle(Throwable event) {
                         }
 
                     });
-                    request.fetch(1);
+                    // More than 1 speedup retrieve while limited in memory
+                    request.fetch(3);
                 } else {
                     eof = true;
                 }
@@ -267,10 +268,8 @@ protected ByteBuf readBlocking() throws IOException {
                 input1 = null;
                 if (inputOverflow != null) {
                     input1 = inputOverflow.poll();
-                    if (input1 == null) {
-                        request.fetch(1);
-                    }
-                } else if (!eof) {
+                }
+                if (!eof) {
                     request.fetch(1);
                 }
                 return ret == null ? null : ret.getByteBuf();