Update submodules

* Add the `FlavorDetails.RxtxFactor` and `FlavorDetails.DataDiskSize` properties.
* Add the `TaskState.ImagePendingUpload` and `TaskState.ImageUploading` properties.
* Add the `User.DomainId` property.
* Add the `UserDetails.DomainId` property.
* Updated documentation for additional properties.

Separate issues (#260, #261, #262) were created to address much of the other functionality.