--- Removed reference to tower in InventorySource and InventoryUpdate model
--- Added a migration for above change
--- Added new CONTROLLER* variables in awx/main/models/credentials/__init__.py
--- Migrated awxkit to new CONTROLLER* variables
--- Updated the tests to use new CONTROLLER* variables
--- Fix some issues with upgrade path, rename more cases
This changset allows the import of YAML formatted resources. The CLI
user can indicate which format to use with the `-f, --format` option.
The CLI help text has been amended to reflect the new feature.
The AWX CLI `export` subcommand offers the option of formatting the output
as YAML or JSON, so it makes sense that the `import` subcommand reflects
this.
A simple test is also provided. In order to ease the task of testing
commands that import resources by reading the stdin, the CLI has been
extended to allow specifying an alternative file descriptor for stdin,
similarly to stdout and stderr.
