Сonsider stream offset in pipeline

[DmitryRomanov]

Here is offset file:

- file: error.log
  inode: 12471806
  source_id: 2393350492
  streams:
    stdout: 13430000
    stderr: 1

Before fixing, we start reading from the minimum offset and accept stdout messages again.

[codecov]

Codecov Report

Attention: Patch coverage is 62.22222% with 17 lines in your changes missing coverage. Please review.

Project coverage is 72.87%. Comparing base (e02c4a6) to head (8449dd5).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
plugin/input/dmesg/dmesg.go	0.00%	5 Missing ⚠️
pipeline/pipeline.go	60.00%	3 Missing and 1 partial ⚠️
plugin/input/http/http.go	71.42%	2 Missing ⚠️
plugin/input/journalctl/journalctl.go	60.00%	2 Missing ⚠️
plugin/input/kafka/consumer.go	60.00%	2 Missing ⚠️
test/test.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #683      +/-   ##
==========================================
+ Coverage   72.28%   72.87%   +0.59%     
==========================================
  Files         137      142       +5     
  Lines       13985    14648     +663     
==========================================
+ Hits        10109    10675     +566     
- Misses       3311     3379      +68     
- Partials      565      594      +29     

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