qa: switch to https protocol for repos' server

qa: switch to https protocol for repos' server

Since the git:// is not reachable any more and have switch to
https://.

The git archive does not support the https protocol, so we couldn't
user the git archive to retrieve the tar ball any more, will split
this into 3 steps:

1, clone the whole ceph repo
2, checkout the commit/tag/branch
3, then change directory to qa/workunits/.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 89177d65988c56324916de8394089b6e4b38aab7)
Conflicts:
- qa/workunits/fs/snaps/snaptest-git-ceph.sh: minor conflicts
- qa/machine_types/schedule_subset.sh: no need to fix this
- qa/tasks/cephfs/xfstests_dev.py: minor confilicts