hg: kulla/dev/langtools: API overhaul snippet->key, step 2.

[robert.field at oracle.com]

Changeset: 9f338748cc74
Author:    rfield
Date:      2015-04-17 19:55 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/9f338748cc74

API overhaul snippet->key, step 2.

! repl/src/api/Key.java
! repl/src/api/Variety.java
! repl/src/impl/EvalStateImpl.java
! repl/src/impl/SnippetImpl.java
! repl/src/impl/SnippetMaps.java