yaml os discovery now respects the os mib_dir definition
mib_dir now only allows strings, not arrays
changed schema validation to account for that
consolidated dell mibs, no reason for them to be spread out
* extend FS switches support
* MIB compilation
* HW and Ver
* sensors and CPU
* tests
* correct version
* try to handle properly "down" as not up, for OperStat like lowerLayerDown
* try to handle properly "down" as not up, for OperStat like lowerLayerDown
* try to handle properly "down" as not up, for OperStat like lowerLayerDown
* try to replace "down" with "not up" :)
* fix other ifOperStatus checks