[MDC-434] simetbox-openwrt-base: add support for simet-lmapd

[MDC-434] simetbox-openwrt-base: add support for simet-lmapd

* Teach the lowram upgrade helpers about lmapd and simet-lmapd
* Bump package version to new simetbox-openwrt-base version 101
  + Remove simet-ma crontab support (moving to simet-lmapd)