fix(pip): normalize names in list_freeze_parse and detect modern pip …

[cdalvaro]

What does this PR do?

Two related bugs in the pip state and module cause a Python package to be "installed" (and reported as changed) on every Salt state run, even when the package is already at the correct version.

Bug 1 — list_freeze_parse does not normalize package names

Commit 68728e6 updated list_() to return normalized package names (lowercase, hyphens) via normalize(). However, list_freeze_parse, which is the fallback used for pip < 9.0, was not updated. It still returns names exactly as they appear in pip freeze output (e.g. "requests_oauthlib" with an underscore).

Because _check_if_installed now receives a normalized prefix (e.g. "requests-oauthlib") and compares it against a CaseInsensitiveDict that only handles case — not underscore vs. hyphen — the lookup always fails. The package is added to target_pkgs and pip is called on every run.

Bug 2 — Post-install detection uses an outdated pip message

After calling pip.install, the state checks pip's stdout to determine whether a package was already present, to avoid reporting it as a change.

The check was:

if line.startswith("Requirement already up-to-date: "):

Modern pip (≥ 10.0) outputs "Requirement already satisfied: ..." instead.

Because the message never matched, already_installed_packages stayed empty and every pip call resulted in the package being reported as "Installed" in the state changes dict.

Fix

• salt/modules/pip.py — list_freeze_parse now computes a normal_prefix and stores each package under its normalized name (normalize(name)), consistent with list_().
• salt/states/pip_state.py — The post-install check now also matches "Requirement already satisfied: ". The package name is extracted by stripping any version specifier with re.split, then normalized with pip.normalize before being stored in already_installed_packages. The comparison with prefix (already normalized) no longer calls .lower() unnecessarily.

Merge requirements satisfied?

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

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Yes