dashboard: always run bench binary with timeout
When the tree is particularly broken,
even the first invocation of bench binary that queries list
of benchmarks can hang.
Fixes golang/go#8844.

LGTM=bradfitz
R=adg, bradfitz
CC=golang-codereviews
https://golang.org/cl/162160043
1 file changed
tree: 7e57648d0c7c135c3d094535f3c3dbd1aac89c9a
  1. app/
  2. builder/
  3. coordinator/
  4. env/
  5. updater/
  6. watcher/
  7. README