Sorna-agent

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**FIX**

* Fix and improve version reference mechanisms.
* Fix missing import error vanished during hostfix cherrypick

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**IMPROVEMENTS**

* It now applies the same UID to the spawned containers if they have the "uid-match"
feature label flag. (backported from develop)

-------------------

**FIX**

* Add missing "sorna-common" dependency and update other requirements.

-------------------

**FIX**

* Fix the wrong version range of an optional depedency package "datadog"

------------------

**IMPROVEMENTS**

* Improve packaging so that setup.py has the source list of dependencies
whereas requirements.txt has additional/local versions from exotic
sources.

* Support exception/event logging with Sentry and runtime statistics with Datadog.

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**FIX**

- Fix interactive user inputs in the batch-mode execution.