[PATCH] Downgrade elog(LOG) to elog(DEBUG1) for pi->node_ids in get_pools()

Hi,

The attached patch downgrades an elog(LOG) to elog(DEBUG1) in get_pools()
(src/utils/pool_process_reporting.c).

The elog statement was added in commit 706ca859c as part of the
pgpool_adm_pcp_proc_info feature. It prints pi->node_ids bitmap values
at LOG level for every connection on every backend whenever pool status
is queried.

In containerized deployments where a metrics exporter (pgpool2_exporter)
continuously polls "show pool_pools", this produces thousands of log
lines per minute. We confirmed the fix eliminates the spam on our
staging cluster under real production-like traffic.

Since the message is purely diagnostic, DEBUG1 is the appropriate level.

GitHub issue: https://github.com/pgpool/pgpool2/issues/153

Regards,
Yishai Tamir