test: fix tests on python2

1dc49d3e (tests: ignore CryptographyDeprecationWarning on python2, 2021-08-13)
was wrong, because this warning includes the path of the software, which
also has a md5sum hash, so the normalization has to be done before the
md5sum normalization, otherwise this consumes an md5sum and they become
off by one, with errors like:

    Expected:
        package: shared at /shared/package/<MD5SUM:0>
        Uninstalling package.
        Installing package.
        package: Checking whether package is installed at shared path: /shared/package/<MD5SUM:0>
        package: [ENV] FOO = bar
        package: Command 'set -e;./configure --prefix=/shared/package/<MD5SUM:0>"' returned non-zero exit status 127.
        package: Compilation error. The package is left as is at /shared/package/<MD5SUM:0>__compile__ where you can inspect what went wrong.
        A shell script slapos.recipe.build.env.sh has been generated. You can source it in your shell to reproduce build environment.
        /bin/sh: 1: ./configure: not found
        While:
          Installing package.
        Error: System error
    Got:
        package: shared at /shared/package/<MD5SUM:1>
        Uninstalling package.
        Installing package.
        package: Checking whether package is installed at shared path: /shared/package/<MD5SUM:1>
        package: [ENV] FOO = bar
        package: Command 'set -e;./configure --prefix=/shared/package/<MD5SUM:1>"' returned non-zero exit status 127.
        package: Compilation error. The package is left as is at /shared/package/<MD5SUM:1>__compile__ where you can inspect what went wrong.
        A shell script slapos.recipe.build.env.sh has been generated. You can source it in your shell to reproduce build environment.
        <BLANKLINE>
        /bin/sh: 1: ./configure: not found
        While:
          Installing package.
        Error: System error
        <BLANKLINE>