Update default proxysql version, drop support for xenial (EOL) and fix small bugs

[mrpk1906]

Hi all,

This PR contain changes:

• Update default proxysql version to 2.3.2 (latest)
• Drop support for xenial
• Remove undefined variables: (removed from 2.0.13) mysql-default_sql_mode, mysql-default_time_zone, mysql-forward_autocommit. Ref: https://proxysql.com/documentation/global-variables
• Hide sensitive data (username, password) when set_fact
• Change percona repo url to https

I tested on Ubuntu 18 and Ubuntu 20. It works well

[codecov]

Codecov Report

Merging #92 (e14bee4) into main (c527827) will not change coverage.
The diff coverage is n/a.

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##             main      #92   +/-   ##
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  Coverage   72.97%   72.97%           
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  Files          10       10           
  Lines        1199     1199           
  Branches      193      193           
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  Hits          875      875           
  Misses        246      246           
  Partials       78       78           

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[markuman]

Works also for me on Ubuntu 18.04 and 20.04

[Andersson007]

Should we say that the role requires Python3 since now? Wouldn't it be a breaking change? (i don't remember the context of the PR)

[Andersson007]

Suggested change

	- 2.3.2
	- 2.3.2

I would suggest having at least the oldest version of proxysql supported by the collection and the latest one there (no need to add now, just an idea)

[markuman]

That's something we can place/add to this issue #75 :)

[markuman]

Should we say that the role requires Python3 since now? Wouldn't it be a breaking change? (i don't remember the context of the PR)

I think it is a natural thing, because the installation role supports just ubuntu 16.04 and 18.04 until now: https://github.com/ansible-collections/community.proxysql/blob/main/roles/proxysql/meta/main.yml

And after dropping 16.04 (because it is EOL since arpil 2021), there is no need to take care about python2 anymore in Ubuntu 18.04 and 20.04.

[markuman]

And after dropping 16.04 (because it is EOL since arpil 2021), there is no need to take care about python2 anymore in Ubuntu 18.04 and 20.04.

...and Ubuntu 22.04 is knocking the door.
But that's another Issue, And if the collection role should focus also on other distributions ....

[Andersson007]

@markuman thanks for clarifying, the PR LGTM

[Andersson007]

@mrpk1906 thanks for the contribution! @markuman thanks for reviewing and testing!