spacewalk-proxy: remove unnecessary dependencies to Squid

[moio]

What does this PR change?

Removes unnecessary dependencies between packages, this is useful for the ongoing containerization effort.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• No tests: already covered

• DONE

Links

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

If you don't need a changelog check, please mark this checkbox:

• No changelog needed

If you uncheck the checkbox after the PR is created, you will need to re-run changelog_test (see below)

Re-run a test

If you need to re-run a test, please mark the related checkbox, it will be unchecked automatically once it has re-run:

• Re-run test "changelog_test"
• Re-run test "backend_unittests_pgsql"
• Re-run test "java_pgsql_tests"
• Re-run test "schema_migration_test_oracle"
• Re-run test "schema_migration_test_pgsql"
• Re-run test "susemanager_unittests"
• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

[moio]

@mcalmer I could not see a good reason to keep the requirement in e337d2d - tried out building a branch of this package from my home project and installation/operation works as expected.

Do you see something I might have missed about it?

[mcalmer]

@moio take care, that squid is in our proxy pattern. In case we install the product on a real system, squid is needed to be installed.

[moio]

@mcalmer it is not, but squid is still pulled in by spacewalk-proxy-management. Is that OK or we want an explicit mention in the pattern?

[mcalmer]

@moio Ok, this will work.

[mcalmer]

Maybe you need a changelog. This package is not touched so often and to submit it we need at least 1 changelog entry.

[juliogonzalez]

@moio yes, a changelog entry is needed.

[moio]

PR test results (no difference from master at the time of writing): https://ci.suse.de/view/Manager/view/Uyuni-PRs/job/uyuni-prs-ci-tests/894/testReport/