info-log seldon-core version on microservice start

[RafalSkolasinski]

Fixes #1718
Closes #1704

But I wonder if maybe we could also log the git commit hash additionally to have it 100% clear what version are users running when they submit logs.

EDIT: actually we only have problem in distinguishing different 1.1.0-SNAPSHOT for example.
If someone will use dated build we will have a clear version. Still my preference would be to version using git hashes but this will correctly leverage existing mechanism.

Edit 2: test added in this PR will also avoid in future problems reported in #1718

[seldondev]

Mon Apr 27 09:26:45 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1751/1.log

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jx get build logs SeldonIO/seldon-core/PR-1751 --build=1

[seldondev]

Mon Apr 27 09:26:58 UTC 2020
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jx get build logs SeldonIO/seldon-core/PR-1751 --build=2

[seldondev]

Mon Apr 27 09:29:50 UTC 2020
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[seldondev]

Mon Apr 27 09:29:52 UTC 2020
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[seldondev]

Mon Apr 27 09:40:37 UTC 2020
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[seldondev]

Mon Apr 27 09:40:42 UTC 2020
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[RafalSkolasinski]

/test integration

[seldondev]

Thu May 7 10:01:15 UTC 2020
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[seldondev]

Wed May 27 10:29:20 UTC 2020
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[seldondev]

Wed May 27 10:29:28 UTC 2020
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[seldondev]

Thu May 28 10:31:27 UTC 2020
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[seldondev]

Thu May 28 10:33:29 UTC 2020
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[seldondev]

Thu May 28 10:34:39 UTC 2020
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[seldondev]

Thu May 28 10:34:41 UTC 2020
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[axsaucedo]

Very useful, I assumed this was already in release.py, definitely good to make sure is there, and test will make sure versions are aligned, looks good!
/approve

[seldondev]

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[seldondev]

Sat May 30 16:48:54 UTC 2020
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[seldondev]

Sat May 30 16:49:20 UTC 2020
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