Remove sshguard package to avoid QA failures

In QA, we have tests that do push over SSH, which is essentially SSH login attempts. When sshguard detects too many ssh attempts in a short span of time, considers it as an abuse attempt and blocks the source IP. Which causes following tests to fail due to Net::ReadTimeout (which is true)

Successful pipelines with these changes - https://gitlab.com/gitlab-org/distribution/gitlab-provisioner/pipelines/36848893 and https://gitlab.com/gitlab-org/distribution/gitlab-provisioner/pipelines/36853655

Closes: team-tasks#188 (closed)