install-repository: fix double output option, add retries, no double repo suffix

Miroslav Vadkertirequested to merge
fix-warning-more-output-options into main

As it turns out, we use both --output and -O and we want just the former. This works, but produces this warning:

Command:
---v---v---v---v---v---
curl --output /etc/yum.repos.d/group_yggdrasil-latest-centos-stream-$releasever.repo.repo -LO https://copr.fedorainfracloud.org/coprs/g/yggdrasil/latest/repo/centos-stream-$releasever/group_yggdrasil-latest-centos-stream-$releasever.repo
---^---^---^---^---^---

Stdout:
---v---v---v---v---v---

---^---^---^---^---^---

Stderr:
---v---v---v---v---v---
Warning: Permanently added '3.140.238.9' (ED25519) to the list of known hosts.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   396  100   396    0     0   8284      0 --:--:-- --:--:-- --:--:--  8250
Warning: Got more output options than URLs
---^---^---^---^---^---

With that also add retries, print the repository content output and do not add double .repo prefix if not needed.

Signed-off-by: Miroslav Vadkerti mvadkert@redhat.com

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