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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[mosajjal]

there shouldn't be any function accepting two different Ctx objects. one should be created from the other (cascade). if that can't happen, we need to change the code to make sure that is the case.