[asan][aclorch] fix a memory leak in the SaiAttrWrapper::swap() (sonic-net#2382)

* fix a leak caused by overriding this->m_attr (which contained a dynamically allocated list) in the SaiAttrWrapper::swap()

Author: Yakiv-Huryk

orchagent/saiattr.cpp

@@ -66,12 +66,10 @@ sai_attr_id_t SaiAttrWrapper::getAttrId() const
 
 void SaiAttrWrapper::swap(SaiAttrWrapper&& other)
 {
-    m_objectType = other.m_objectType;
-    m_meta = other.m_meta;
-    m_attr = other.m_attr;
-    m_serializedAttr = other.m_serializedAttr;
-    other.m_attr = sai_attribute_t{};
-    other.m_serializedAttr.clear();
+    std::swap(m_objectType, other.m_objectType);
+    std::swap(m_meta, other.m_meta);
+    std::swap(m_attr, other.m_attr);
+    std::swap(m_serializedAttr, other.m_serializedAttr);
 }
 
 void SaiAttrWrapper::init(