libpod: remove unused ContainerState() fucntion

First that function claims to deep copy but then actually return the
original state so it does not work correctly, given that there are no
users just remove it instead of fixing it.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/container.go

@@ -1220,23 +1220,6 @@ func (c *Container) HostNetwork() bool {
 	return true
 }
 
-// ContainerState returns containerstate struct
-func (c *Container) ContainerState() (*ContainerState, error) {
-	if !c.batched {
-		c.lock.Lock()
-		defer c.lock.Unlock()
-
-		if err := c.syncContainer(); err != nil {
-			return nil, err
-		}
-	}
-	returnConfig := new(ContainerState)
-	if err := JSONDeepCopy(c.state, returnConfig); err != nil {
-		return nil, fmt.Errorf("copying container %s state: %w", c.ID(), err)
-	}
-	return c.state, nil
-}
-
 // HasHealthCheck returns bool as to whether there is a health check
 // defined for the container
 func (c *Container) HasHealthCheck() bool {