OS-1840 fmdump shall emit JSON (rm feedback)

*** 45,55 ****
  extern int nvpair_value_match(nvpair_t *, int, char *, char **);
  extern int nvpair_value_match_regex(nvpair_t *, int, char *, regex_t *,
      char **);
  
  extern void nvlist_print(FILE *, nvlist_t *);
! extern void nvlist_print_json(FILE *, nvlist_t *);
  extern void dump_nvlist(nvlist_t *, int);
  
  /*
   * Private nvlist printing interface that allows the caller some control
   * over output rendering (as opposed to nvlist_print and dump_nvlist).
--- 45,55 ----
  extern int nvpair_value_match(nvpair_t *, int, char *, char **);
  extern int nvpair_value_match_regex(nvpair_t *, int, char *, regex_t *,
      char **);
  
  extern void nvlist_print(FILE *, nvlist_t *);
! extern int nvlist_print_json(FILE *, nvlist_t *);
  extern void dump_nvlist(nvlist_t *, int);
  
  /*
   * Private nvlist printing interface that allows the caller some control
   * over output rendering (as opposed to nvlist_print and dump_nvlist).