Merge remote-tracking branch 'origin/HTTPCLIENT-2379' into HTTPCLIENT-2379

# Conflicts:
#	httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/H2SharingConnPool.java
#	httpclient5/src/test/java/org/apache/hc/client5/http/impl/nio/H2SharingConnPoolTest.java

Author: arturobernalg

httpclient5/src/test/java/org/apache/hc/client5/http/impl/nio/H2SharingPerRoutePoolTest.java

@@ -89,7 +89,7 @@ void testReleaseReusable() {
         Assertions.assertEquals(2, pool.release(poolEntry1, true));
         Assertions.assertEquals(1, pool.release(poolEntry1, true));
         Assertions.assertEquals(0, pool.release(poolEntry1, true));
-        Assertions.assertEquals(0, pool.release(poolEntry1, true));
+        Assertions.assertEquals(-1, pool.release(poolEntry1, true));
     }
 
     @Test
@@ -103,8 +103,8 @@ void testReleaseNonReusable() {
 
     @Test
     void testReleaseNonPresent() {
-        Assertions.assertEquals(0, pool.release(poolEntry1, true));
-        Assertions.assertEquals(0, pool.release(poolEntry2, true));
+        Assertions.assertEquals(-1, pool.release(poolEntry1, true));
+        Assertions.assertEquals(-1, pool.release(poolEntry2, true));
     }
 
     @Test