JDK-8176055: Fix heap dumps on Java 8u141+

In Java 8u141 (1.8.0_141-b15) and newer, the
com.sun.management.HotSpotDiagnostic::dumpHeap API has changed and now
requires all heap dumps to end with the .hprof file extension.

Before this change, servers running 8u141 would be unable to perform a
heap dump.

For more information, please see the official release notes of Java 8
Update 141, linked below.
http://www.oracle.com/technetwork/java/javase/8u141-relnotes-3720385.html

Spigot-Server-Patches/Allow-Reloading-of-Custom-Permissions.patch

@@ -6,11 +6,11 @@ Subject: [PATCH] Allow Reloading of Custom Permissions
 https://github.com/PaperMC/Paper/issues/49
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index 815a26284..7a2c19159 100644
+index 3007a724b..e8b8e86e8 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -0,0 +0,0 @@ public final class CraftServer implements Server {
-             Bukkit.getLogger().severe("Could not write heap to " + file);
+             return false;
          }
      }
 +