go/zodb: LiveCache: Reclassify all objects on cache control change

If cache control changes, all objects needs to go through new cache
control as what was e.g. pinned before could be in other class
from the point of view of new cache control.

Tests pending...

go/zodb/connection.go

@@ -268,6 +268,14 @@ func (cache *LiveCache) forEach(f func(IPersistent)) {
 // It is not safe to call SetControl simultaneously to other cache operations.
 func (cache *LiveCache) SetControl(c LiveCacheControl) {
 	cache.control = c
+
+	// reclassify all objects
+	c2 := *cache
+	cache.objtab = make(map[Oid]*weak.Ref)
+	cache.pinned = make(map[Oid]IPersistent)
+	c2.forEach(func(obj IPersistent) {
+		cache.setNew(obj.POid(), obj)
+	})
 }
 
 // get is like Get, but used when we already know object class.

go/zodb/persistent_test.go

@@ -816,6 +816,8 @@ func TestLiveCache(t0 *testing.T) {
 
 	assert.Equal(obj._v_cookie, "")
 	assert.Equal(objDD._v_cookie, "")
+
+	// TODO reclassify tests
 }
 
 // TODO Map & List tests.