qa/rbd: update the cephadm required distro

Signed-off-by: Deepika Upadhyay <dupadhya@redhat.com>

diff --git a/qa/suites/rbd/iscsi/0-single-container-host.yaml b/qa/suites/rbd/iscsi/0-single-container-host.yaml
new file mode 120000 (symlink)
index 0000000..7406e74
--- /dev/null
+++ b/qa/suites/rbd/iscsi/0-single-container-host.yaml
@@ -0,0 +1 @@
+.qa/distros/single-container-host.yaml
\ No newline at end of file

diff --git a/qa/suites/rbd/iscsi/supported-random-distro$/centos_8.yaml b/qa/suites/rbd/iscsi/supported-random-distro$/centos_8.yaml
deleted file mode 120000 (symlink)
index 750bfb4..0000000
--- a/qa/suites/rbd/iscsi/supported-random-distro$/centos_8.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../../../../distros/supported-all-distro/centos_8.yaml
\ No newline at end of file

diff --git a/qa/suites/rbd/iscsi/supported-random-distro$/rhel_8.yaml b/qa/suites/rbd/iscsi/supported-random-distro$/rhel_8.yaml
deleted file mode 120000 (symlink)
index 046a2f6..0000000
--- a/qa/suites/rbd/iscsi/supported-random-distro$/rhel_8.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../../../../distros/supported-all-distro/rhel_8.yaml
\ No newline at end of file