Reject invalid urls in linkchecker

[ollie27]

For example root-relative links will now be rejected.

Also remove some exceptions which have since been fixed and fix a typo in
the broken redirect handling.

[rust-highfive]

r? @brson

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[alexcrichton]

@bors: r+ 01386e6

[bors]

⌛ Testing commit 01386e6 with merge 165c187...

[bors]

💔 Test failed - auto-win-msvc-64-opt-rustbuild

[alexcrichton]

@bors: retry

• Cascading failure on bots when interrupted when performing git operations #34595

On Fri, Jul 1, 2016 at 5:58 AM, bors notifications@github.com wrote:

💔 Test failed - auto-win-msvc-64-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-win-msvc-64-opt-rustbuild/builds/1631

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[bors]

☔ The latest upstream changes (presumably #34611) made this pull request unmergeable. Please resolve the merge conflicts.