merge revision(s) 53718: [Backport #12320]
Skip SHA from test_digest_constants for LibreSSL 2.3 The first one of ruby/openssl#40 https://github.com/ruby/openssl/issues/40#issuecomment-159839338
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 53718: [Backport #12320]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e