dashboard/config: tune kernel timeouts

See #516 for description of the problem.

The new scheme is:

1. RCU stalls the highest priority.
CONFIG_RCU_CPU_STALL_TIMEOUT=100
which results in stalls detected after 100-101 secs.

2. Then softlockup detector.
kernel.watchdog_thresh = 55 (sysctl)
which surprisingly detects stalls after 110-132 secs.

3. Then hung tasks and workqueue stalls.
Unfortunately we can't separate them because that would
require setting "no output" timeout to 10+ minutes.
workqueue.watchdog_thresh=140 (cmdline)
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=140
Both are detected after 140-280 secs.

4. Finally, "no output" crashes.
Detected by vm.MonitorExecution after 300 secs.

Fixes #516

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