Add error counts / dimm channel for edac collector

[Manognagrandhi]

# HELP node_edac_channel_correctable_errors_total Total correctable memory errors for this channel.
# TYPE node_edac_channel_correctable_errors_total counter
node_edac_channel_correctable_errors_total{channel="0",controller="0",csrow="0",dimm_label="mc0_csrow0_channel0"} 0
node_edac_channel_correctable_errors_total{channel="0",controller="0",csrow="1",dimm_label="mc0_csrow1_channel0"} 0
node_edac_channel_correctable_errors_total{channel="0",controller="0",csrow="2",dimm_label="mc0_csrow2_channel0"} 0
node_edac_channel_correctable_errors_total{channel="0",controller="0",csrow="3",dimm_label="mc0_csrow3_channel0"} 0
node_edac_channel_correctable_errors_total{channel="1",controller="0",csrow="0",dimm_label="mc0_csrow0_channel1"} 0
node_edac_channel_correctable_errors_total{channel="1",controller="0",csrow="1",dimm_label="mc0_csrow1_channel1"} 0
node_edac_channel_correctable_errors_total{channel="1",controller="0",csrow="2",dimm_label="mc0_csrow2_channel1"} 0
node_edac_channel_correctable_errors_total{channel="1",controller="0",csrow="3",dimm_label="mc0_csrow3_channel1"} 0
node_edac_channel_correctable_errors_total{channel="2",controller="0",csrow="0",dimm_label="mc0_csrow0_channel2"} 0
node_edac_channel_correctable_errors_total{channel="2",controller="0",csrow="1",dimm_label="mc0_csrow1_channel2"} 0
node_edac_channel_correctable_errors_total{channel="2",controller="0",csrow="2",dimm_label="mc0_csrow2_channel2"} 123
node_edac_channel_correctable_errors_total{channel="2",controller="0",csrow="3",dimm_label="mc0_csrow3_channel2"} 0
node_edac_channel_correctable_errors_total{channel="3",controller="0",csrow="0",dimm_label="mc0_csrow0_channel3"} 0
node_edac_channel_correctable_errors_total{channel="3",controller="0",csrow="1",dimm_label="mc0_csrow1_channel3"} 0
node_edac_channel_correctable_errors_total{channel="3",controller="0",csrow="2",dimm_label="mc0_csrow2_channel3"} 0
node_edac_channel_correctable_errors_total{channel="3",controller="0",csrow="3",dimm_label="mc0_csrow3_channel3"} 0
node_edac_channel_correctable_errors_total{channel="4",controller="0",csrow="0",dimm_label="mc0_csrow0_channel4"} 0
node_edac_channel_correctable_errors_total{channel="4",controller="0",csrow="1",dimm_label="mc0_csrow1_channel4"} 0
node_edac_channel_correctable_errors_total{channel="4",controller="0",csrow="2",dimm_label="mc0_csrow2_channel4"} 0
node_edac_channel_correctable_errors_total{channel="4",controller="0",csrow="3",dimm_label="mc0_csrow3_channel4"} 0
node_edac_channel_correctable_errors_total{channel="5",controller="0",csrow="0",dimm_label="mc0_csrow0_channel5"} 0
node_edac_channel_correctable_errors_total{channel="5",controller="0",csrow="1",dimm_label="mc0_csrow1_channel5"} 0
node_edac_channel_correctable_errors_total{channel="5",controller="0",csrow="2",dimm_label="mc0_csrow2_channel5"} 0
node_edac_channel_correctable_errors_total{channel="5",controller="0",csrow="3",dimm_label="mc0_csrow3_channel5"} 0
node_edac_channel_correctable_errors_total{channel="6",controller="0",csrow="0",dimm_label="mc0_csrow0_channel6"} 0
node_edac_channel_correctable_errors_total{channel="6",controller="0",csrow="1",dimm_label="mc0_csrow1_channel6"} 0
node_edac_channel_correctable_errors_total{channel="6",controller="0",csrow="2",dimm_label="mc0_csrow2_channel6"} 0
node_edac_channel_correctable_errors_total{channel="6",controller="0",csrow="3",dimm_label="mc0_csrow3_channel6"} 0
node_edac_channel_correctable_errors_total{channel="7",controller="0",csrow="0",dimm_label="mc0_csrow0_channel7"} 0
node_edac_channel_correctable_errors_total{channel="7",controller="0",csrow="1",dimm_label="mc0_csrow1_channel7"} 0
node_edac_channel_correctable_errors_total{channel="7",controller="0",csrow="2",dimm_label="mc0_csrow2_channel7"} 0
node_edac_channel_correctable_errors_total{channel="7",controller="0",csrow="3",dimm_label="mc0_csrow3_channel7"} 0
# HELP node_edac_correctable_errors_total Total correctable memory errors.
# TYPE node_edac_correctable_errors_total counter
node_edac_correctable_errors_total{controller="0"} 123
# HELP node_edac_uncorrectable_errors_total Total uncorrectable memory errors.
# TYPE node_edac_uncorrectable_errors_total counter
node_edac_uncorrectable_errors_total{controller="0"} 0

[SuperQ]

This needs a DCO sign-off. You can use git commit -s --amend to add it.

[SuperQ]

Tests don't pass.