RFR: 8173401: Update VERSION_FEATURE for JDK 11

[David Holmes]

It's time to increment the actual version to 11 for JDK 11.

Joe Darcy and I have worked through numerous test issues that delayed 
the update and I've been addressing a number of issues in hotspot 
related to obsolete/expired flag warnings. I have tested the update with 
JDK tiers 1-3, and hotspot tiers 1-4. So we should not see any CI 
failures for either JDK or HS pipelines.

Bug: https://bugs.openjdk.java.net/browse/JDK-8173401

Change:

--- a/make/autoconf/version-numbers
+++ b/make/autoconf/version-numbers
@@ -25,7 +25,7 @@

  # Default version numbers to use unless overridden by configure

-DEFAULT_VERSION_FEATURE=10
+DEFAULT_VERSION_FEATURE=11
  DEFAULT_VERSION_INTERIM=0
  DEFAULT_VERSION_UPDATE=0
  DEFAULT_VERSION_PATCH=0

Thanks,
David