RFR(XXS) JDK-8191042 Deprecate VM option CheckEndorsedAndExtDirs

[Ioi Lam]

Hi, please review this very small change:

     https://bugs.openjdk.java.net/browse/JDK-8191042

The endorsed standards override mechanism and the extensions mechanism
were removed in JDK 9 via JEP 220.

The CheckEndorsedAndExtDirs option is disabled by default. However, if
it's enabled in the command-line, the VM would check the endorsed and ext
directories so that the VM terminates if they exist. These checks are no
longer needed in JDK 10 and beyond and can be removed.

This task is the first step in the removal -- we need to mark this option
as deprecated and print a warning message when it's used. The option
itself, and the code that uses it, will be removed in a subsequent JDK
release.

Tested with hotspot tier1/2

Thanks
- Ioi

===================================

diff -r d76a6042f5d7 src/hotspot/share/runtime/arguments.cpp
--- a/src/hotspot/share/runtime/arguments.cpp    Wed Nov 08 09:03:24 
2017 -0800
+++ b/src/hotspot/share/runtime/arguments.cpp    Wed Nov 15 14:00:58 
2017 -0800
@@ -383,6 +383,7 @@
    { "MinRAMFraction",               JDK_Version::jdk(10), 
JDK_Version::undefined(), JDK_Version::undefined() },
    { "InitialRAMFraction",           JDK_Version::jdk(10), 
JDK_Version::undefined(), JDK_Version::undefined() },
    { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10),  
JDK_Version::undefined(), JDK_Version::undefined() },
+  { "CheckEndorsedAndExtDirs",      JDK_Version::jdk(10), 
JDK_Version::undefined(), JDK_Version::undefined() },

    // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted 
by obsolete_in then expired_in:
    { "DefaultMaxRAMFraction",        JDK_Version::jdk(8), 
JDK_Version::undefined(), JDK_Version::undefined() },