The single `pipelines()` function is now replaced by multiple functions
for different purposes:
- `edgeCorePipelines()` defines the pipelines that create an edge
commit. This is used by both the `edge-commit` and `edge-container`
images.
- `edgeCommitPipelines()` and `edgeContainerPipelines()` define the
pipelines for `edge-commit` and `edge-container` respectively. They
share the core pipelines but differ in their final pipeline for
assembling the image into either a tarball or a container.
- `edgeInstallerPipeline()` shares almost no common parts with other
pipelines (only the `buildPipeline()`).
The `pipelines` function for each image type is set during creation of
the instance.
Individual pipeline functions are no longer methods of the image type.
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