qa/rados/upgrade/jewel-x-singleton: do not run on Bionic

The test was failing because it did not explicitly set "os_type" and
"os_version", and teuthology defaulted to Ubuntu Bionic.

Jewel is not supported on Ubuntu Bionic, so we should not try to run tests on
that Ubuntu version.

NOTE: This commit is not cherry-picked from master because the fix is
luminous-specific (there is no "rados/upgrade/jewel-x-singleton" test after
luminous).

Signed-off-by: Nathan Cutler <ncutler@suse.com>

diff --git a/qa/suites/rados/upgrade/jewel-x-singleton/distros/.qa b/qa/suites/rados/upgrade/jewel-x-singleton/distros/.qa
new file mode 120000 (symlink)
index 0000000..fea2489
--- /dev/null
+++ b/qa/suites/rados/upgrade/jewel-x-singleton/distros/.qa
@@ -0,0 +1 @@
+../.qa
\ No newline at end of file

diff --git a/qa/suites/rados/upgrade/jewel-x-singleton/distros/centos_latest.yaml b/qa/suites/rados/upgrade/jewel-x-singleton/distros/centos_latest.yaml
new file mode 120000 (symlink)
index 0000000..bd9854e
--- /dev/null
+++ b/qa/suites/rados/upgrade/jewel-x-singleton/distros/centos_latest.yaml
@@ -0,0 +1 @@
+.qa/distros/supported/centos_latest.yaml
\ No newline at end of file

diff --git a/qa/suites/rados/upgrade/jewel-x-singleton/distros/ubuntu_latest.yaml b/qa/suites/rados/upgrade/jewel-x-singleton/distros/ubuntu_latest.yaml
new file mode 120000 (symlink)
index 0000000..3a09f9a
--- /dev/null
+++ b/qa/suites/rados/upgrade/jewel-x-singleton/distros/ubuntu_latest.yaml
@@ -0,0 +1 @@
+.qa/distros/supported/ubuntu_latest.yaml
\ No newline at end of file