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neels uploaded patch set #2 to this change.

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nft_kpi: retrieve counters in a separate thread

Introduce an NFT thread which does:
- periodically run nftables command to read all counters
- parse the response
- update rate_ctr values.

The main thread still runs the rule addition / removal when a HNB
registers or deregisters. See the comment added in nft_kpi.c, starting
with "A more scalable solution...".

This patch requires the new osmo_stats_report_lock(), see 'Depends'.

Related: SYS#6773
Depends: libosmocore Ib335bea7d2a440ca284e6c439066f96456bf2c2d
Change-Id: I9dc54e6bc94c553f45adfa71ae8ad70be4afbc8f
---
M src/osmo-hnbgw/hnbgw.c
M src/osmo-hnbgw/nft_kpi.c
M src/osmo-hnbgw/osmo_hnbgw_main.c
M src/osmo-hnbgw/tdefs.c
4 files changed, 171 insertions(+), 34 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/40/36540/2

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