Time-Based Release Versioning

This is the primary implementation subtask of JEP 322.

JEP: http://openjdk.java.net/jeps/322
CSR: https://bugs.openjdk.java.net/browse/JDK-8192855

Specdiff: http://cr.openjdk.java.net/~mr/jeps/322/specdiff/
Webrev: http://cr.openjdk.java.net/~mr/jeps/322/rev/

The substantive changes are in these files:

  make/autoconf/jdk-version.m4
  make/autoconf/version-numbers
  src/java.base/share/classes/java/lang/Runtime.java
  src/java.base/share/classes/java/lang/VersionProps.java.template
  test/jdk/java/lang/Runtime/Version/Basic.java

Otherwise, this is mostly a straightforward renaming of identifiers
involving (major|minor|security) to (feature|interim|update).

We've already forked HotSpot for JDK 10 stabilization, so to reduce risk
this patch does not attempt to rename all internal identifiers of the
form .*(major|minor|security).* in the HotSpot code. That can be done
as a cleanup later on.

jdk-tier{1,2,3} and hs-tier1 test runs are clean.