Bug 33274: Use YAML::XS instead of YAML in update_responses

------------

The following perl modules need to be installed to run the script:

  FindBin YAML File::Slurp Digest::SHA XML::Writer File::Temp

  FindBin YAML::XS File::Slurp Digest::SHA XML::Writer File::Temp

  IO::CaptureOutput Parallel::ForkManager XML::LibXML LWP JSON

On Debian / Ubuntu you can install them with:

```

  # apt-get install libfindbin-libs-perl libyaml-perl libfile-slurp-perl \

                    libdigest-sha-perl libxml-writer-perl \

  # apt-get install libfindbin-libs-perl libyaml-libyaml-perl \

                    libfile-slurp-perl libdigest-sha-perl libxml-writer-perl \

                    libio-captureoutput-perl libparallel-forkmanager-perl \

                    libxml-libxml-perl libwww-perl libjson-perl

```

On Red Hat / Fedora you can install them with:

```

  # for module in FindBin YAML File::Slurp Digest::SHA XML::Writer \

  # for module in FindBin YAML::XS File::Slurp Digest::SHA XML::Writer \

                  File::Temp IO::CaptureOutput Parallel::ForkManager \

                  XML::LibXML LWP JSON

    do yum install "perl($module)"; done

use feature "state";

use English;

use FindBin;

use YAML qw(LoadFile);

use YAML::XS qw(LoadFile);

use File::Slurp;

use File::Path qw(make_path);

use Digest::SHA qw(sha256_hex);