Cannot create pipe in sub-directory if module is in different sub-directory

[drullo]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [x] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

Node: 8.11.3
NPM: 6.4.1
Angular CLI: 7.1.2
Windows 10

Repro steps

1. Move app.module.ts to a subdirectory called "modules"
2. Observe failure from ng g p pipes/test-pipe -m modules/app
3. In contrast, observe that ng g c components/test-component -m modules/app does succeed

The log given by the failure

Specified module 'modules/app' does not exist.
Looked in the following directories:
    /src/app/pipes/modules/app
    /src/app/pipes/test-pipe
    /src/app/pipes/modules
    /src/app/pipes
    /src/app
    /src

Desired functionality

The expectation is that this would successfully create the pipe in the pipes subdirectory (creating it if necessary) and import it into modules/app.module.ts. This functionality does work when creating components or services in a subdirectory, just not pipes.

Mention any other details that might be useful

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