New group with load averages similar to these returned by uptime,
but multiplied with 100 to avoid floats.

Add new wrsCpuLoadGroup with objects:
-- wrsCPULoadAvg1min
-- wrsCPULoadAvg5min
-- wrsCPULoadAvg15min

Additionally:
-- update of MIB
-- update Makefile
-- update init.c
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>