testing: make it clearer why test flake in Issue #774 happens
testing: make it clearer why test flake in Issue #774 happens

pagespeed/ngx_pagespeed,wanrui/ngx_pagespeed,0x0mar/ngx_pagespeed,wanrui/ngx_pagespeed,0x0mar/ngx_pagespeed,digideskio/ngx_pagespeed,pagespeed/ngx_pagespeed,digideskio/ngx_pagespeed