grep-excuses: Strip all HTML tags, not just anchors, from excuses

James McCoyrequested to merge
jamessan/devscripts:dehtml-grep-excuses into master

This is particularly noticeable in the autopkgtest excuses, which use <span> tags to color the output.

$ grep-excuses neovim
neovim (0.2.2-3 to 0.3.0-2)
    Maintainer: Debian Vim Maintainers
    7 days old (needed 5 days)
    missing build on ppc64el: neovim (from 0.2.2-3)
    old binaries left on all: neovim-runtime (from 0.2.2-3) (but ignoring cruft, so nevermind)
    Piuparts tested OK - https://piuparts.debian.org/sid/source/n/neovim.html
    autopkgtest for ruby-neovim/0.7.1-1: amd64: <span style="background:#87d96c">Pass</span>

Signed-off-by: James McCoy jamessan@debian.org

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