[collectd] AIX: WPAR and cpu patchs.

[Manuel Luis Sanmartín Rozada]

The cpu.c patches are to detect where one cpu in AIX go off, when you
remove a virtual processor
the cpu still reporting data but the sum of idle, sys, user and wait
is equal in two intervals.

The wpar patches are for a plugin to collect cpu, load and memory from
Workload Partitioning in AIX.
It was tested with system WPAR in aix 6.1.

I use the existing types in types.db.

The  structure of rrds for each wpar in a system is:

wpar-xxx/cpu-system.rrd
wpar-xxx/cpu-user.rrd
wpar-xxx/load.rrd
wpar-xxx/memory-cached.rrd
wpar-xxx/memory-free.rrd
wpar-xxx/memory-total.rrd
wpar-xxx/memory-used.rrd

I attach some sample graphs.

More info about wpars:
http://www.ibm.com/developerworks/aix/library/au-wpar61aix/index.html
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