Add support for multiple host names in each request about csrhelp

[rmhrisk]

To add a SAN extension in the "ANY" example it would be similar to this:

var altNames = new org.pkijs.simpl.GENERAL_NAMES({
         names: [
                  new org.pkijs.simpl.GENERAL_NAME({
                           NameType: 1,
                           Name: data.dns
                           })
                  ]
});

 extensions.extensions_array.push(new org.pkijs.simpl.EXTENSION({
         extnID: "2.5.29.17", // subjectAltName
         critical: false,
         extnValue: altNames.toSchema().toBER(false)
     }));
}

 var attribute = new org.pkijs.simpl.ATTRIBUTE({
     type: "1.2.840.113549.1.9.14", // pkcs-9-at-extensionRequest
     values: [extensions.toSchema()]
});

pkcs10_simpl.attributes.push(attribute);