Add --may-exist parameter to addition of ts

Without --may-exist, ovn-ic-nbctl ts-add ts1 could return error
and doesn't execute the following steps of function.

Signed-off-by: Lucas Vargas Dias <lucas.vdias@luizalabs.com>

image/cinc/install_fedora_pkg.sh

@@ -16,7 +16,7 @@ systemctl mask \
 	systemd-udevd.service \
 	systemd-vconsole-setup.service
 
-dnf -y install --skip-broken \
+dnf -y --skip-broken install \
   autoconf \
   automake \
   conntrack-tools \

ovn_cluster.sh

@@ -819,7 +819,7 @@ EOF
     chmod 0755 ${FAKENODE_MNT_DIR}/create_ovn_res.sh
 
     # add ts transit switch.
-    ${RUNC_CMD} exec ${CENTRAL_IC_ID} ovn-ic-nbctl --may-exist ts-add ts1
+    ${RUNC_CMD} exec ${CENTRAL_IC_ID} ovn-ic-nbctl ts-add ts1
     # wait for ovn-ic to kick in
     while sleep 2; do
         ${RUNC_CMD} exec ${CENTRAL_IC_ID} ovn-nbctl ls-list | grep -q ts1 && break