Remove the policy.kern after policy is build and replace with symbolic link.

We want to shink the space required by selinux-policy for small cloud images.
This file has no purpose after policy is built.
diff --git a/libsemanage/src/semanage_store.c b/libsemanage/src/semanage_store.c
index 57ef49f..4b040c3 100644
--- a/libsemanage/src/semanage_store.c
+++ b/libsemanage/src/semanage_store.c
@@ -1234,6 +1234,10 @@
 
 	retval = 0;
       cleanup:
+	(void) unlink(active_kernel);
+	if (symlink(store_pol, active_kernel) < 0) {
+		ERR(sh, "Unable to create sybolic link from %s to %s error code %d.", active_kernel, store_pol, r);
+	}
 	free(storepath);
 	return retval;
 }