Istio support (#30)

* adding istio files

* fix the envoy CMakList file

* fix the envoy CMakList file

* adding the .mod file

* adding the webhook injector image

* adding istio files

* adding istio files

* fix the envoy CMakList file

* fix the envoy CMakList file

* adding the .mod file

* adding the webhook injector image

* adding istio files

* pulling from dev

* fix the envoy CMakList file

* adding istio files

* fix missing header

* fix wrong name of library

* fix envoy CMakeLists

* remove cloud guard names

* remove cloud guard names

* adding istio files

* adding istio files

* [JIRA] INXT-44274: test agent image

* add Daniel fixes

* remove zlib library

* remove nano attachment ut

attachments/nano_attachment/include/mock_nano_access.h

@@ -0,0 +1,22 @@
+#ifndef __MOCK_ACCESS_H__
+#define __MOCK_ACCESS_H__
+
+#include "cmock.h"
+
+extern "C" {
+#include <unistd.h>  // For the access function
+}
+
+class NanoAccessMocker : public CMockMocker<NanoAccessMocker>
+{
+public:
+    MOCK_METHOD2(access, int(const char *path, int mode));
+};
+
+CMOCK_MOCK_FUNCTION2(
+    NanoAccessMocker,
+    access,
+    int(const char *path, int mode)
+);
+
+#endif // __MOCK_ACCESS_H__