Fix shlib loaded: free memory, handle lib reload

- introduce loader_reset() that frees all memory
- resolve memory leak in loader_format_shlibpath()
- correctly handle library reload: check if a function has been
  retrieved already. Don't leak memory (strdup()), and handle multiple
  reloads of different functions from the same SO

common/utils/load_module_shlib.h

@@ -47,6 +47,7 @@ typedef struct {
    char               *thisshlib_path;
    uint32_t           numfunc;
    loader_shlibfunc_t *funcarray;
+   uint32_t           len_funcarray;
 }loader_shlibdesc_t;
 
 typedef struct {
@@ -90,5 +91,6 @@ extern void * get_shlibmodule_fptr(char *modname, char *fname);
 extern loader_data_t loader_data;
 #endif /* LOAD_MODULE_SHLIB_MAIN */
 #define load_module_shlib(M, F, N, I) load_module_version_shlib(M, NULL, F, N, I)
+void loader_reset();
 #endif