openssl: add OpenSSL::OCSP::SingleResponse

* ext/openssl/ossl_ocsp.c: Add OCSP::SingleResponse that represents an
  OCSP SingleResponse structure. Also add two new methods #responses
  and #find_response to OCSP::BasicResponse. A BasicResponse has one or
  more SingleResponse. We have OCSP::BasicResponse#status that returns
  them as an array of arrays, each containing the content of a
  SingleResponse, but this is not useful. When validating an OCSP
  response, we need to look into the each SingleResponse and check their
  validity but it is not simple. For example, when validating for a
  certificate 'cert', the code would be like:

    # certid_target is an OpenSSL::OCSP::CertificateId for cert
    basic = res.basic
    result = basic.status.any? do |ary|
      ary[0].cmp(certid_target) &&
        ary[4] <= Time.now && (!ary[5] || Time.now <= ary[5])
    end

  Adding OCSP::SingleResponse at the same time allows exposing
  OCSP_check_validity(). With this, the code above can be rewritten as:

    basic = res.basic
    single = basic.find_response(certid_target)
    result = single.check_validity

* test/openssl/test_ocsp.rb: Test this.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55457 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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