disable error led
decrease nginx log level
add parameter rtw_power_mgnt=0 to module 8189es
update hp2sm

* r3974
    - add parameter -a to ifconfig

* r3978
    - add warning for ssh keys

* r3979
    - add led setting to enable heartbeat

* r3980
    - use boot led
fix ledplay on startup
move shutdown of svc services to svc down script
improve sysdetails for extra sanity monitoring

add hard coded sanity check before writing info out ...
* check once a second, not every 100ms
* keep 1800 dumps - that are 30 minutes
* filter processes - only top 20 memory consumers and top 20 processor
  consumers are dumped
* check cpu-percents, not absolute values
bump system image version to 3.11.15
reset error before sanity check to turn off led
trick around weird /tmp permissions ...

in some first-boot conditions
bump version of image to 3.11.16 after release
Revert "trick around weird /tmp permissions ..."

This reverts commit c39fe4dfea8340f19b973dbd252708ac56718188.