ovn: fix ovn trying to create socket in nix store

[xanderio]

Description of changes

Without this change ovn-controller tries to create it's control socket inside the store.

2024-07-02T09:35:00Z|00001|fatal_signal|WARN|could not unlink "/nix/store/kmxmghyaqlg9byvrgkmlwpklzlx0gg6s-ovn-24.03.2/var/run/ovn/ovn-controller.329266.ctl" (No such file or directory)

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[github-actions]

Successfully created backport PR for release-24.05:

• [Backport release-24.05] ovn: fix ovn trying to create socket in nix store #324007