Removes --tls flag from docker and swarm-manager daemons

Previously, the --tls flag was being used along with other tls
related flags to secure the docker daemon. The --tls flag should
not be used to perform mutual authentication between the docker
daemon and client. This patch removes the use of --tls throughout
the code base.

Closes-Bug: #1500982

Change-Id: I1def8e7a2725c0cdbb8862c6a8199b17e8ae841e

doc/source/tls.rst

@@ -99,7 +99,7 @@ is an example for Docker.
 
 ::
 
-    docker -H tcp://<bay_api_address>:2376 --tls --tlsverify \
+    docker -H tcp://<bay_api_address>:2376 --tlsverify \
         --tlscacert ca.crt \
         --tlskey client.key \
         --tlscert client.crt

magnum/templates/docker-swarm/fragments/write-docker-service.sh

@@ -23,7 +23,6 @@ END_SERVICE_TOP
 if [ $INSECURE == 'False'  ]; then
 
 cat >> /etc/systemd/system/docker.service << END_TLS
-          --tls \\
           --tlsverify \\
           --tlscacert="/etc/docker/ca.crt" \\
           --tlskey="/etc/docker/server.key" \\

magnum/templates/docker-swarm/fragments/write-swarm-master-service.sh

@@ -25,7 +25,6 @@ END_SERVICE_TOP
 if [ $INSECURE = 'False'  ]; then
 
 cat >> /etc/systemd/system/swarm-manager.service << END_TLS
-                                  --tls \\
                                   --tlsverify \\
                                   --tlscacert=/etc/docker/ca.crt \\
                                   --tlskey=/etc/docker/server.key \\