Add page_cycler test machine setup notes to httpd2_linux.conf. No Code Change. BUG=none TEST=none Review URL: http://codereview.chromium.org/256069 Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: 427100d21de9695b7283e38e59eec11100c49b14