Remove containerd specific parts of the plugin package to prepare its
move out of the main repository. Separate the plugin registration
singleton into a separate package.
Separating out the plugin package and registration makes it easier to
implement external plugins without creating a dependency loop.
Signed-off-by: Derek McGowan <derek@mcg.dev>
The plugins packages defines the plugins used by containerd.
Move all the types and properties to this package.
Signed-off-by: Derek McGowan <derek@mcg.dev>
This is not really an error in most cases as most people do not use
devmapper, however this shows up as an error in the logs and in the
plugin service when querying the plugins.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
