openbsd_pkg: set TERM to 'dumb' in execute_command

[eest]

SUMMARY

Keeps pkg_add happy when someone running ansible is using a TERM that the managed OpenBSD host does not know about.

Fixes #5738.

Selection of specific TERM from discussion at
https://marc.info/?l=openbsd-tech&m=167290482630534&w=2

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

openbsd_pkg

ADDITIONAL INFORMATION

Before change:

$ TERM=xterm-kitty ansible -i hosts openbsd_pkg_tests -u root -m community.general.openbsd_pkg  -a 'name=jq state=present'
[WARNING]: You are running the development version of Ansible. You should only run Ansible from "devel" if you are modifying the Ansible engine, or trying out features under development. This is a rapidly changing source of code and can become unstable at any point.
[WARNING]: packaging Python module unavailable; unable to validate collection Ansible version requirements
X.X.X.X | FAILED! => {
    "build": false,
    "changed": false,
    "msg": "No progress meter: failed termcap lookup on xterm-kitty\n",
    "name": [
        "jq"
    ],
    "state": "present"
}

After change:

$ TERM=xterm-kitty ansible -i hosts openbsd_pkg_tests -u root -m community.general.openbsd_pkg  -a 'name=jq state=present'
[WARNING]: You are running the development version of Ansible. You should only run Ansible from "devel" if you are modifying the Ansible engine, or trying out features under development. This is a rapidly changing source of code and can become unstable at any point.
[WARNING]: packaging Python module unavailable; unable to validate collection Ansible version requirements
X.X.X.X | CHANGED => {
    "build": false,
    "changed": true,
    "name": [
        "jq"
    ],
    "state": "present"
}

I have run my test playbook (https://github.com/eest/openbsd_pkg-tests) with this change with a successful result.

[ansibullbot]

cc @JoergFiedler @MacLemon @bcoca @dch @jasperla @mekanix @opoplawski @overhacked @tuxillo
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[felixfontein]

Thanks for your contribution!

[felixfontein]

Looks good to me! I'll merge in a week if nobody objects.

[github-actions]

Docs Build 📝

Thank you for contribution!✨

This PR has been merged and your docs changes will be incorporated when they are next published.

[patchback]

Backport to stable-6: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-6/b97bee3fd6f2a579501f75863285cc689ca63343/pr-6149

Backported as #6190

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[felixfontein]

@eest thank you very much for your contribution!