Fix fedora-copr#3375

Of course only for Copr projects that has configured to have their
storage in Pulp, not all Copr projects.

Fix fedora-copr#3375

Of course only for Copr projects that has configured to have their
storage in Pulp, not all Copr projects.

There are three possible options how to implement this.

1. The Most straightforward is to not generate repofiles ourselves and let Pulp
   do it. The downside is that we would have to pass additional parameters (it
   is possible though) such as repo priority, module hotfixes attribute, etc,
   and figure out how to count repo downloads
2. Generate repofiles ourselves, only point to `baseurl` in Pulp. This IMHO the
   best option for keeping compatibility between storage on the backend and in
   Pulp, so I implement this option in this PR.
3. Adding a Lighttpd redirect for `baseurl` of the Pulp-stored projects to Pulp
   content URL. This will be needed in the future to ensure that users don't
   have to re-enable Copr repositories, once those projects are migrated to
   Pulp. But this will be hard to implement, so we decided to do it when the
   time comes.

See fedora-copr/copr#3375

When an alternative storage (such as Pulp) for Copr is used, the
pubkey.gpg is still being stored on Copr backend. Therefore we can't
always construct the correct pubkey URL here in the DNF plugin.

Fix fedora-copr#3375

Of course only for Copr projects that has configured to have their
storage in Pulp, not all Copr projects.

There are three possible options how to implement this.

1. The Most straightforward is to not generate repofiles ourselves and let Pulp
   do it. The downside is that we would have to pass additional parameters (it
   is possible though) such as repo priority, module hotfixes attribute, etc,
   and figure out how to count repo downloads
2. Generate repofiles ourselves, only point to `baseurl` in Pulp. This IMHO the
   best option for keeping compatibility between storage on the backend and in
   Pulp, so I implement this option in this PR.
3. Adding a Lighttpd redirect for `baseurl` of the Pulp-stored projects to Pulp
   content URL. This will be needed in the future to ensure that users don't
   have to re-enable Copr repositories, once those projects are migrated to
   Pulp. But this will be hard to implement, so we decided to do it when the
   time comes.

Fix fedora-copr#3375

Of course only for Copr projects that has configured to have their
storage in Pulp, not all Copr projects.

There are three possible options how to implement this.

1. The Most straightforward is to not generate repofiles ourselves and let Pulp
   do it. The downside is that we would have to pass additional parameters (it
   is possible though) such as repo priority, module hotfixes attribute, etc,
   and figure out how to count repo downloads
2. Generate repofiles ourselves, only point to `baseurl` in Pulp. This IMHO the
   best option for keeping compatibility between storage on the backend and in
   Pulp, so I implement this option in this PR.
3. Adding a Lighttpd redirect for `baseurl` of the Pulp-stored projects to Pulp
   content URL. This will be needed in the future to ensure that users don't
   have to re-enable Copr repositories, once those projects are migrated to
   Pulp. But this will be hard to implement, so we decided to do it when the
   time comes.

Fix fedora-copr#3375

Of course only for Copr projects that has configured to have their
storage in Pulp, not all Copr projects.

There are three possible options how to implement this.

1. The Most straightforward is to not generate repofiles ourselves and let Pulp
   do it. The downside is that we would have to pass additional parameters (it
   is possible though) such as repo priority, module hotfixes attribute, etc,
   and figure out how to count repo downloads
2. Generate repofiles ourselves, only point to `baseurl` in Pulp. This IMHO the
   best option for keeping compatibility between storage on the backend and in
   Pulp, so I implement this option in this PR.
3. Adding a Lighttpd redirect for `baseurl` of the Pulp-stored projects to Pulp
   content URL. This will be needed in the future to ensure that users don't
   have to re-enable Copr repositories, once those projects are migrated to
   Pulp. But this will be hard to implement, so we decided to do it when the
   time comes.

See fedora-copr/copr#3375

When an alternative storage (such as Pulp) for Copr is used, the
pubkey.gpg is still being stored on Copr backend. Therefore we can't
always construct the correct pubkey URL here in the DNF plugin.