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What type of PR is this?
/kind bug
What this PR does / Why we need it:
Twitter seems to be doing UserAgent sniffing, and rejecting non-browser user agents, breaking CI.
Which issue(s) this PR fixes:
N/A
Special notes for your reviewer:
This change makes htmltest use a Chrome Linux user agent to work around this issue. To support editing the HTTP headers required an update to htmltest.