Merge branch 'topic/asn1-overhaul'

* topic/asn1-overhaul:
  asn1: do not treat EOC octets as part of content octets
  asn1: prevent EOC octets from being in the middle of the content
  asn1: harmonize OpenSSL::ASN1::*#to_der
  asn1: clean up OpenSSL::ASN1::Constructive#to_der
  asn1: use ossl_asn1_tag()
  asn1: allow tag number to be >= 32 for universal tag class
  asn1: prohibit indefinite length form for primitive encoding
  asn1: allow constructed encoding with definite length form
  asn1: avoid truncating OID in OpenSSL::ASN1::ObjectId#oid
  asn1: disallow NULL to be passed to asn1time_to_time()
  asn1: check for illegal 'unused_bits' value of BitString
  asn1: initialize 'unused_bits' attribute of BitString with 0
  asn1: require tag information when instantiating generic type
  asn1: remove an unnecessary function prototype
  asn1: rearrange tests
  asn1: infinite length -> indefinite length

Author: rhenium