dashboard/coordinator: add SSD disk option, turn off auto-update
dashboard/coordinator: add SSD disk option, turn off auto-update

Change-Id: I4d2dfe34a6c2fde8603704e716b7c91ad285ecec
Reviewed-on: https://go-review.googlesource.com/1561
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

golang/build,evandbrown/build,proppy/build,evandbrown/build,golang/build,proppy/build,golang/build,proppy/build,evandbrown/build,golang/build,proppy/build