Update istio (#34)

* update istio

* update istio

* fixing istio

* fix library name

* fix library name

* fix missing defenition of advanced-model

* fix append

* fix wrong name

* fix pvc issue

* fix config.go file

* fix config.go file

* fix config.go file

* fix config.go file

---------

Co-authored-by: Daniel Eisenberg <danielei@checkpoint.com>

attachments/CMakeLists.txt

@@ -1,3 +1,6 @@
-add_subdirectory(envoy)
 add_subdirectory(nano_attachment)
-add_subdirectory(nginx)
+if ("${ATTACHMENT_TYPE}" STREQUAL "envoy")
+    add_subdirectory(envoy)
+else()
+    add_subdirectory(nginx)
+endif()