PCP: Fix multiple metrics name problems

PCP: Fix multiple metrics name problems

Replace metric name "kernel.percpu.cpu.wait.total" (which was defined
but not used) with "kernel.percpu.cpu.iowait".

"kernel.percpu.cpu.int" was used but not defined. Replace it with
"kernel.percpu.cpu.irq.total" and define it.

Fix metric name "mem.util.buffers" -> Replace it with "mem.util.bufmem".

Fix metric name "mem.util.stack" -> Replace it with
"mem.util.kernelStack".

Fix metric name "mem.util.vmused" -> Replace it with
"mem.util.vmallocUsed".

Define metric name "disk.dev.total_bytes".

Fix metric name "network.ip.ipoutrequests" -> Replace it with
"network.ip.outrequests".

Fix metric name "network.ip.ipreasmreqds" -> Replace it with
"network.ip.reasmreqds".

Fix metric name "network.ip.ipreasmoks" -> Replace it with
"network.ip.reasmoks".

Fix metric name "network.tcp.tcpestabresets" -> Replace it with
"network.tcp.estabresets".

FIx metric name "network.tcp.tcpretranssegs" -> Replace it with
"network.tcp.retranssegs".

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>