'generateName' support for Kubernetes provider

[kanarip]

Problem Statement

Some of the Nulecule applications in the nulecule-library, such as MariaDB and MongoDB, can only be used once within an application's (nested) graph, because the Pod and Service created by the Kubernetes provider carries a non-unique name (in their pod and service definitions).

Suggested Solution(s)

• Support the generateName property in the artifacts, such that a mariadb-centos7-atomicapp can be pulled in more than once and pods and services are not called a duplicate "mariadb".
• Substitute the included atomicapp's name with the name the parent gives the application in the graph, i.e.;

  graph: [
    {
      "name": "myapp-mariadb",
      "source": "docker://projectatomic/mariadb-centos7-atomicapp"
    },
    {
      "name": "anotherapp-mariadb",
      "source": "docker://projectatomic/mariadb-centos7-atomicapp"
    }
  ]

• Recommend and document forking a Nulecule application like so, for example, which is then used here.