Rebase to master, move code to the internal.mixed

Author: akarnokd

src/main/java/io/reactivex/internal/operators/flowable/FlowableSwitchMapCompletable.java renamed to src/main/java/io/reactivex/internal/operators/mixed/FlowableSwitchMapCompletable.java

@@ -11,7 +11,7 @@
  * the License for the specific language governing permissions and limitations under the License.
  */
 
-package io.reactivex.internal.operators.flowable;
+package io.reactivex.internal.operators.mixed;
 
 import java.util.concurrent.atomic.AtomicReference;
 

src/test/java/io/reactivex/InternalWrongNaming.java

@@ -185,10 +185,7 @@ public void flowableNoObserver() throws Exception {
                 "FlowableConcatWithCompletable",
                 "FlowableMergeWithSingle",
                 "FlowableMergeWithMaybe",
-                "FlowableMergeWithCompletable",
-                "FlowableSwitchMapCompletable",
-                "FlowableSwitchMapSingle",
-                "FlowableSwitchMapMaybe"
+                "FlowableMergeWithCompletable"
         );
     }
 }

src/test/java/io/reactivex/internal/operators/flowable/FlowableSwitchMapCompletableTest.java renamed to src/test/java/io/reactivex/internal/operators/mixed/FlowableSwitchMapCompletableTest.java

@@ -11,7 +11,7 @@
  * the License for the specific language governing permissions and limitations under the License.
  */
 
-package io.reactivex.internal.operators.flowable;
+package io.reactivex.internal.operators.mixed;
 
 import static org.junit.Assert.*;