autobuilder.conf.example: Variables to support buildhistory-web
autobuilder.conf.example: Variables to support buildhistory-web

BUILD_HISTORY_WEB: Run buildhistory-web import.py
BUILD_HISTORY_WEB_DIR: where buildhistory-web is located

Signed-off-by: Beth Flanagan <86e3219095765dcc0f6f42aef4bd43803a05b796@intel.com>

denny820909/builder,denny820909/builder,denny820909/builder,denny820909/builder