Test that pulp can upload package_environments

[preethit]

https://pulp.plan.io/issues/1003
Test package environments can be uploaded

$ pulp-admin rpm repo uploads environment

Command: environment
Description: creates a new package environment

Available Arguments:

  --bg                 - if specified, the client process will end immediately
                         (the task will continue to run on the server)
  --repo-id            - (required) unique identifier; only alphanumeric, ., -,
                         and _ allowed
  -v                   - display extra information about the upload process
  --environment-id, -i - (required) id of the package environment
  --name, -n           - (required) name of the package environment
  --description, -d    - (required) description of the package environment
  --display-order      - display order for the package environment. Defaults to
                         1024
  --group, -g          - package group IDs to include in the package
                         environment; multiple may be indicated by specifying
                         the argument multiple times
The following options are required but were not specified:
  --repo-id
  --environment-id
  --name
  --description