[Bug 243438] dns/dnsviz: dnsviz graph fails with "No such file or directory while opening share/dnsviz/..."

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243438

            Bug ID: 243438
           Summary: dns/dnsviz: dnsviz graph fails with "No such file or
                    directory while opening share/dnsviz/..."
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: pi at FreeBSD.org
          Reporter: john at saltant.com
             Flags: maintainer-feedback?(pi at FreeBSD.org)
          Assignee: pi at FreeBSD.org

Synopsis
========

The graph subcommand is unable to access files in the share directory.


$ dnsviz graph -Thtml -O -r example.json
/usr/local/lib/python3.7/site-packages/pygraphviz/agraph.py:1367:
RuntimeWarning: Warning: No such file or directory while opening
share/dnsviz/icons/error.png
Error: No or improper image file="share/dnsviz/icons/error.png"
in label of edge RRset-10|example.com|NS -> DNSKEY-3|example.com|8|58821
Warning: No such file or directory while opening share/dnsviz/icons/error.png
Error: No or improper image file="share/dnsviz/icons/error.png"
in label of edge RRset-11|example.com|A -> DNSKEY-3|example.com|8|58821
Warning: No such file or directory while opening share/dnsviz/icons/error.png
Error: No or improper image file="share/dnsviz/icons/error.png"
in label of edge RRset-13|example.com|MX -> DNSKEY-3|example.com|8|58821
Warning: No such file or directory while opening share/dnsviz/icons/error.png
Error: No or improper image file="share/dnsviz/icons/error.png"
in label of edge RRset-14|example.com|AAAA -> DNSKEY-3|example.com|8|58821
Warning: No such file or directory while opening share/dnsviz/icons/error.png
Error: No or improper image file="share/dnsviz/icons/error.png"
in label of edge NSEC-2|fbl5gzdn98.example.com|A ->
DNSKEY-3|example.com|8|58821

  warnings.warn(b"".join(errors).decode(self.encoding), RuntimeWarning)
Error reading template file "share/dnsviz/html/dnssec-template.html": No such
file or directory


Analysis
========

/usr/local/lib/python3.7/site-packages/dnsviz/config.py sets

    _prefix = ''

instead of

    _prefix = '/usr/local'

During the package building process, it appears that install_data is only
populated with the real prefix during the stage target, by which point a copy
of config.py has already been generated with the empty prefix.

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