[webserver-test] fix TestInvalidHeaders on macOS
[webserver-test] fix TestInvalidHeaders on macOS

Change-Id: I19cfb90ba18bf8b9125ca635f2417f4058c4c5f1
Reviewed-on: http://gerrit.cloudera.org:8080/15779
Reviewed-by: Hao Hao <99da4db57fde39d3df9f1908299d10b8082bf864@cloudera.com>
Reviewed-by: Volodymyr Verovkin <09e3bf3dfe66dab7f34308b89180361dde21402e@cloudera.com>
Tested-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>

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