bootstrapped AppConfig name is hyphenated

[dkliban]

I got the following error the first time I tried to generate migrations from a bootstrapped plugin. The hyphen should be removed.

  File "/src/pulp-replica/pulp_replica/app/__init__.py", line 4
    class Pulp-ReplicaPluginAppConfig(PulpPluginAppConfig):
              ^
SyntaxError: invalid syntax

[dkliban]

The name needs to also be correct in <plugin_name>/__init__.py