Clickhouse output last batch

[parsa97]

When using a pcap file, the last batch of data is missed because the context closes before it is sent. To solve this, I've created a new context for ClickHouse that remains open until the last batch is sent, and then it closes after the main context is closed.

Fix issue: #32

Tested with default configuration

Before Change

Dnsmonster log

metrics: {"clickhouseFailed":{"count":0},"clickhouseSentToOutput":{"count":3657536},"clickhouseSkipped":{"count":0},"packetLossPercent":{"value":0},"packetsCaptured":{"value":3668278},"packetsDropped":{"value":0},"packetsDuplicate":{"count":0},"packetsOverRatio":{"count":0}}

Clickhouse select count(*)

select count(*) from DNS_LOG
┌─count()─┐
│ 3650000 │
└─────────┘

After Change

Dnsmonster log

metrics: {"clickhouseFailed":{"count":0},"clickhouseSentToOutput":{"count":3657536},"clickhouseSkipped":{"count":0},"packetLossPercent":{"value":0},"packetsCaptured":{"value":3668278},"packetsDropped":{"value":0},"packetsDuplicate":{"count":0},"packetsOverRatio":{"count":0}}

Clikchouse select count(*)

select count(*) from DNS_LOG;
┌─count()─┐
│ 3657536 │
└─────────┘

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