Change ListProcesses to ListPids

These rpcs only return pids []uint32 so should be named that way in
order to have other rpcs that list Processes such as Exec'd processes.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

runtime/task.go

@@ -25,8 +25,8 @@ type Task interface {
 	Kill(context.Context, uint32, uint32, bool) error
 	// Exec adds a process into the container
 	Exec(context.Context, ExecOpts) (Process, error)
-	// Processes returns all pids for the container
-	Processes(context.Context) ([]uint32, error)
+	// Pids returns all pids for the task
+	Pids(context.Context) ([]uint32, error)
 	// Pty resizes the processes pty/console
 	ResizePty(context.Context, uint32, ConsoleSize) error
 	// CloseStdin closes the processes stdin