Reduce logging verbosity of the OpenVPN RoadWarrior connection merge script

[m-dilorenzi]

Description

The script responsible for merging OpenVPN RoadWarrior connection records
currently produces an excessive amount of log entries. It logs on every
execution cycle, even when there are no records to merge, which pollutes the
system logs and makes it harder to spot the events that actually matter.

Current behavior

• The script logs verbosely on each run, regardless of whether any real merge
  operation takes place.
• Log entries are generated even when there is nothing to move from RAM to
  persistent storage.

Expected behavior

• The script should log only when an actual merge of connection records
  occurs, i.e. when records are moved from RAM (/var/openvpn/...) to persistent
  storage (/mnt/data/openvpn/...).
• When no merge is performed, the script should run silently (no log output).

Rationale

Logging only on real merge events will:

• significantly reduce log noise,
• keep the logs focused on meaningful operations,
• make troubleshooting easier by ensuring each log line corresponds to an
  actual data movement.

[github-actions]

Testing image version: 8.8.0-dev.316.20260805083724.ee76e28

[m-dilorenzi]

QA

Storage connection with no connection records to move

1. Log in to NethSecurity
2. Connect and configure a new storage
3. Verify that no logs starting with openvpn-merge-connections-db are present in /var/log/messages

grep openvpn-merge-connections-db /var/log/messages

Storage connection with connection records to move

1. Log in to NethSecurity
2. Configure a RoadWarrior OpenVPN and establish some client connections
3. Verify that the connections are visible in the dedicated table
4. Connect and configure a new storage
5. Verify that logs starting with openvpn-merge-connections-db, indicating the number of connection records moved to the storage, are present in /var/log/messages

grep openvpn-merge-connections-db /var/log/messages

[gsanchietti]

Verified