network: move ibft parsing before all other network cmdline parser

otherwise the config produced by ibft will not get processed
i18n: check for setfont and loadkeys binaries
dmraid/parse-dm.sh: if rd.md=0, use dmraid for imsm and ddf
dmraid/mdraid: improve hostonly recognition

Factor out get_devpath_block(), which also fixes a dmraid hostonly bug.

Also only include dmraid and mdraid, if they are actually in use.