qa/suites/rados: do not test with el7

since we stopped building master on el7, there is no need to test
cephadm with el7 anymore.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/qa/suites/rados/cephadm/smoke/distro/centos_7.yaml b/qa/suites/rados/cephadm/smoke/distro/centos_7.yaml
deleted file mode 120000 (symlink)
index 5ad8254..0000000
--- a/qa/suites/rados/cephadm/smoke/distro/centos_7.yaml
+++ /dev/null
@@ -1 +0,0 @@
-.qa/distros/all/centos_7.yaml
\ No newline at end of file

diff --git a/qa/suites/rados/cephadm/smoke/distro/rhel_7.yaml b/qa/suites/rados/cephadm/smoke/distro/rhel_7.yaml
deleted file mode 120000 (symlink)
index b776cd2..0000000
--- a/qa/suites/rados/cephadm/smoke/distro/rhel_7.yaml
+++ /dev/null
@@ -1 +0,0 @@
-.qa/distros/all/rhel_7.yaml
\ No newline at end of file