Fix documentation IP ranges: e.g., 192.0.2.* instead of 192.*.2.*.

[ktossell]

Ipv4Addr::is_documentation() matches 513 /24 blocks when it should only match 3.

[rust-highfive]

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[alexcrichton]

Thanks! Could you add a test for this as well?

[ktossell]

@alexcrichton I added some more cases to the ipv4_properties test. It now checks all three documentation ranges, and it verifies that non-zero values are excluded for the fields that used to be _. fb68fb1

[alexcrichton]

Thanks! Could you also squash these down? Other than that r=me.

[ktossell]

Sure, squashed and rebased.

[alexcrichton]

@bors: r+ 6e5f960

Thanks!

[Manishearth]

This fails http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/5710/steps/test/logs/stdio

[bors]

⌛ Testing commit 6e5f960 with merge 06b52fe...

[Manishearth]

@bors r- force

(fails tests)

[bors]

⛄ The build was interrupted to prioritize another pull request.

[ktossell]

Fixed the test.

[alexcrichton]

@bors: r+ d45c22b

[bors]

⌛ Testing commit d45c22b with merge 5e3b756...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt