docker-compose: bugfix (#1523)

• docker-compose: bugfix

1. removed svcname and used prefix name instead, to avoid terminlogogy confusion.
2. improved accuracy of service status determination using 'docker ps' instead of 'docker-compose ps'

• Re: [ClusterLabs/resource-agents] docker-compose: bugfix (#1523)

1. set binpath default to /usr/bin/docker-compose and removed default value manipulation
2. added -n for $DKPS string test