Revert "Kernel#inspect: improve consistency and do not call #to_s."
Revert "update PP with recent Kernel#inspect change. Patch by Yusuke Endoh."
r36699 cause test-all failure on test/drb/test_drb.rb and
test/drb/test_drbssl.rb. Run test-all before commit.
Moreover its ChangeLog formst is wrong: see CommitterHowto
https://bugs.ruby-lang.org/projects/ruby/wiki/CommitterHowto#ChangeLog
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e