Change swarm template file names from manager to master

Registered by Manjeet Singh Bhatia

Magnum will be supporting multiple masters in a bay. Right now we see template file names in docker- swarm
as swarm.yaml that should be swarm_master.yaml. write-swarm-manager-service.yaml to write-swarm-master-service.yaml,
and all the nova instance also have name swarm-master instead of swarm manager.

Blueprint information

Status:
Complete
Approver:
Adrian Otto
Priority:
Low
Drafter:
Manjeet Singh Bhatia
Direction:
Approved
Assignee:
Manjeet Singh Bhatia
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon liberty-3
Started by
Adrian Otto
Completed by
Adrian Otto

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As a point of reference the name "master" describes the function of the role of the leader in a swarm cluster. The term "manager" indicates the mode of the agent that runs on the master to accept connections from the swarm-agent containers.

This is what it looks like when you use Docker Machine to create a swarm:

http://paste.openstack.org/show/441826/

Using the term "master" rather than "manager" is more appropriate for the name of the nova instances that run the swarm-agent-master container(s).

Gerrit topic: https://review.openstack.org/#q,topic:bp/manager-to-master,n,z

Addressed by: https://review.openstack.org/219872
    Change manager to master in docker-swarm

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