reef: qa/cephfs: switch to ubuntu 22.04 for stock kernel testing

This is for reef only since we don't have rhel8 images (which results
in failure to schedule fs suite run), so switch to using ubuntu 22.04.

Signed-off-by: Venky Shankar <vshankar@redhat.com>

diff --git a/qa/cephfs/mount/kclient/overrides/distro/stock/rhel_8.yaml b/qa/cephfs/mount/kclient/overrides/distro/stock/rhel_8.yaml
deleted file mode 120000 (symlink)
index 133acf2..0000000
--- a/qa/cephfs/mount/kclient/overrides/distro/stock/rhel_8.yaml
+++ /dev/null
@@ -1 +0,0 @@
-.qa/distros/all/rhel_8.yaml
\ No newline at end of file

diff --git a/qa/cephfs/mount/kclient/overrides/distro/stock/ubuntu_22.04.yaml b/qa/cephfs/mount/kclient/overrides/distro/stock/ubuntu_22.04.yaml
new file mode 120000 (symlink)
index 0000000..0a708b4
--- /dev/null
+++ b/qa/cephfs/mount/kclient/overrides/distro/stock/ubuntu_22.04.yaml
@@ -0,0 +1 @@
+.qa/distros/all/ubuntu_22.04.yaml
\ No newline at end of file