- Closes#557.
- Breaking change: removes `.upToNextOption` for labels on volumes as
this is not what is done for containers, and it forces the argument to
precede the options if a label is supplied, which is non-intuitive.
## Type of Change
- [ ] Bug fix
- [x] New feature
- [x] Breaking change
- [x] Documentation update
## Motivation and Context
Consistent features and UX across managed resources.
## Testing
- [x] Tested locally
- [x] Added/updated tests
- [x] Added/updated docs
- Closes#150, #394.
- Introduces `AttachmentConfiguration` type so that we can add key-value
options to `--network` in the future.
- Eliminates redundant `ContainersService.Item` type.
- Since we now ensure at ContainersService that hostnames will not
conflict, the network helper IP allocator now simply provides the
existing IP if for an allocation on an existing hostname, which should
handle (in an eventually consistent way) the case where a container
fails to deallocate an IP on shutdown.
J Logan