~/work/ClickHouse/dbms/tests/integration$ find . -name '*.py' | xargs sed -i -r -e 's/macroses/macros/g' # [#CLICKHOUSE-2]

There are common cases where a message doesn't end with a row delimiter.
This patch allows specifying a row_delimiter char to compensate that.

https://github.com/yandex/ClickHouse/issues/2298

* Macos: fix mysql link

* Macos: Fix mysql include

* doc

* Try fix version generate

* Macos: allow build with mariadb-connector-c

Refactoring that also fixes CLICKHOUSE-3858

without specifying errorlog, I got

```
E               Logging trace to /var/log/clickhouse-server/clickhouse-server.log
E               Logging errors to clickhouse-server.err.log
E               Poco::Exception. Code: 1000, e.code() = 13, e.displayText() = Access to file denied: /clickhouse-server.err.log, e.what() = Access to file denied
```