[Bug 247437] net-mgmt/flow-tools: errors with Python 3.7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247437

            Bug ID: 247437
           Summary: net-mgmt/flow-tools: errors with Python 3.7
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bofh at freebsd.org
          Reporter: andrew.hotlab at hotmail.com
          Assignee: bofh at freebsd.org
             Flags: maintainer-feedback?(bofh at freebsd.org)

I just discovered that building this port with the default Python version (at
this time, the 3.7 branch) breaks flow-report(1) because of (I guess) Python's
syntax changes. Here is an example:

% flow-cat 2020-06-19 | flow-report -v
TYPE=ip-destination-address/ip-source-port
  File "/usr/local/bin/flow-rptfmt", line 113
    print "Ignores:                 %s" % self.field_vals['ignores']
                                      ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean
print("Ignores:                 %s" % self.field_vals['ignores'])?
flow-report: pclose(flow-rptfmt -f ascii): failed exit code=1.



I do not know Python, but I tried to fix it by adding parentheses to the
print() calls to the file /usr/local/bin/flow-rptfmt, but I was only able to go
a bit further, and I gave up with this:

  File "/usr/local/bin/flow-rptfmt", line 175
    print i.ljust(self.field_lens[y]),
          ^
SyntaxError: invalid syntax
flow-report: pclose(flow-rptfmt -f ascii): failed exit code=1.

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