[analyzer] print() JSONify: ExplodedNode revision

Summary: Revert node-ID removal.

Reviewers: NoQ, xazax.hun, ravikandhadai, baloghadamsoftware, Szelethus

Subscribers: szepet, rnkovacs, a.sidorin, mikhail.ramalho, donat.nagy, dkrupp,
             cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D62658

llvm-svn: 362249