Fixes id-spq-ets-uri encoding from UTF8String to IA5String

Created by: bsmelo

As per Section 3.9.1 Signature policy Identifier from RFC3126: This document specifies the following qualifiers:

  *  spuri: This contains the web URI or URL reference to the
     signature policy

  *  spUserNotice: This contains a user notice which should be
     displayed whenever the signature is validated.

-- sigpolicyQualifierIds defined in this document

SigPolicyQualifierId ::= OBJECT IDENTIFIER

   id-spq-ets-uri OBJECT IDENTIFIER ::= { iso(1)
   member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
   smime(16) id-spq(5) 1 }

  SPuri ::= IA5String

But the implementation was incorrectly using UTF8String

Signed-off-by: Bruno Melo brunosm@tst.jus.br