Make graphdrivers work with pluginv2.

As part of making graphdrivers support pluginv2, a PluginGetter
interface was necessary for cleaner separation and avoiding import
cycles.

This commit creates a PluginGetter interface and makes pluginStore
implement it. Then the pluginStore object is created in the daemon
(rather than by the plugin manager) and passed to plugin init as
well as to the different subsystems (eg. graphdrivers, volumedrivers).
A side effect of this change was that some code was moved out of
experimental. This is good, since plugin support will be stable soon.

Signed-off-by: Anusha Ragunathan <anusha@docker.com>
Upstream-commit: fefea805e930a67fb6327f8e59415932861358cb
Component: engine

components/engine/pkg/plugins/plugins.go

@@ -83,8 +83,8 @@ func (p *Plugin) Client() *Client {
 	return p.client
 }
 
-// IsLegacy returns true for legacy plugins and false otherwise.
-func (p *Plugin) IsLegacy() bool {
+// IsV1 returns true for V1 plugins and false otherwise.
+func (p *Plugin) IsV1() bool {
 	return true
 }