trace group defiined for shared_rng

Unittests fixed

2 mbedtls functions were updated to reflect the api

Author: Antti Kauppila

test/coap-service/unittest/stub/mbedtls_stub.c

@@ -260,11 +260,11 @@ void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
 }
 
 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
-                    mbedtls_md_handle_t md_info,
-                    int (*f_entropy)(void *, unsigned char *, size_t),
-                    void *p_entropy,
-                    const unsigned char *custom,
-                    size_t len )
+                            const mbedtls_md_info_t * md_info,
+                            int (*f_entropy)(void *, unsigned char *, size_t),
+                            void *p_entropy,
+                            const unsigned char *custom,
+                            size_t len )
 {
     return mbedtls_stub.crt_expected_int;
 }
@@ -275,7 +275,7 @@ int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len
 }
 
 // from md.h
-mbedtls_md_handle_t mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
+const mbedtls_md_info_t *mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
 {
     return 0;
 }