Common subcommands for all defaults.
- Closes#384.
- Replaces `registry default` and `system dns default` subcommands with
`system property`.
- Users can use `system property ls` to see details about each supported
default value.
- `system property set` implements reasonable validation for all
properties.
- NOTE: Probing of the registry for `registry default set` was removed,
which means users will find out about a botched setting when pulling or
pushing.
- Updates docs.
## Type of Change
- [ ] Bug fix
- [x] New feature
- [x] Breaking change
- [x] Documentation update
## Motivation and Context
See #384.
## 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.
- Part of #384.
- Rename to reflect that these are not just client defaults.
- Relocate so callers don't need the heavyweight coupling to
ContainerClient to access the type.
J Logan