Replace execdrivers with containerd implementation

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
Signed-off-by: Anusha Ragunathan <anusha@docker.com>

daemon/exec_linux.go

@@ -0,0 +1,26 @@
+package daemon
+
+import (
+	"github.com/docker/docker/container"
+	"github.com/docker/docker/daemon/caps"
+	"github.com/docker/docker/daemon/exec"
+	"github.com/docker/docker/libcontainerd"
+)
+
+func execSetPlatformOpt(c *container.Container, ec *exec.Config, p *libcontainerd.Process) error {
+	if len(ec.User) > 0 {
+		uid, gid, additionalGids, err := getUser(c, ec.User)
+		if err != nil {
+			return err
+		}
+		p.User = &libcontainerd.User{
+			UID:            uid,
+			GID:            gid,
+			AdditionalGids: additionalGids,
+		}
+	}
+	if ec.Privileged {
+		p.Capabilities = caps.GetAllCapabilities()
+	}
+	return nil
+}