Increase ClientAliveInterval on cfg node

Set ssh timeout to get tempest test run pass on models with
mitaka+trusty (due to some restrictions we run tempest on cfg
node).

Change-Id: I4322f8bb80278dbee872a91e539b56677c46a1d6
diff --git a/tcp_tests/templates/shared-salt.yaml b/tcp_tests/templates/shared-salt.yaml
index 653eef9..f3b8414 100644
--- a/tcp_tests/templates/shared-salt.yaml
+++ b/tcp_tests/templates/shared-salt.yaml
@@ -581,7 +581,7 @@
     -C 'I@salt:master' state.sls openssh &&
     salt --hard-crash --state-output=mixed --state-verbose=False
     -C 'I@salt:master' cmd.run "sed -i 's/PasswordAuthentication no/PasswordAuthentication
-    yes/' /etc/ssh/sshd_config && sed -i 's/ClientAliveInterval 300/ClientAliveInterval 3000/' /etc/ssh/sshd_config && service ssh reload"
+    yes/' /etc/ssh/sshd_config && sed -i 's/ClientAliveInterval 300/ClientAliveInterval 18000/' /etc/ssh/sshd_config && service ssh reload"
   node_name: {{ HOSTNAME_CFG01 }}
   retry: {count: 3, delay: 5}
   skip_fail: false