redfishpower: remove --hostsfile option

Problem: The redfishpower --hostsfile option is oddly included in the
project as an option.  The suspicion is it was copy and paste from
another project.  The short option for the option is not configured,
but the long option is.  It is not documented in --help output, but is
oddly documented in the manpage.

Drop the option.

man/redfishpower.8.in

@@ -20,12 +20,6 @@ set simultaneously is limited by the file descriptor limit of the
 .B select(2)
 system call.
 .TP
-.I "-f, --hostsfile file"
-Alternate option to
-.I --hostname,
-specify a file with all hosts. File shall have one host or hostrange
-listed per line.
-.TP
 .I "-H, --header string"
 Set extra HEADER to use.
 .TP

src/redfishpower/redfishpower.c

@@ -97,7 +97,6 @@ struct powermsg {
 #define OPTIONS "h:H:S:O:F:C:P:G:D:v"
 static struct option longopts[] = {
  {"hostname", required_argument, 0, 'h' },
- {"hostsfile", required_argument, 0, 'f' },
  {"header", required_argument, 0, 'H' },
  {"statpath", required_argument, 0, 'S' },
  {"onpath", required_argument, 0, 'O' },
@@ -878,43 +877,6 @@ static void usage(void)
  exit(1);
 }
 
-/* copied from xread.c */
-static void _remove_trailing_whitespace(char *s)
-{
- char *p = s + strlen(s) - 1;
-
- while (p >= s && isspace(*p))
- *p-- = '\0';
-}
-
-static void readhostsfile(const char *file)
-{
- char buf[1024];
- FILE *stream;
-
- if (!hosts) {
- if (!(hosts = hostlist_create(NULL)))
- err_exit(true, "hostlist_create");
- }
-
- if (!(stream = fopen(file, "r")))
- err_exit(true, "error opening file %s", file);
-
- while (fgets(buf, 1024, stream)) {
- _remove_trailing_whitespace(buf);
- /* ignore empty lines */
- if (strlen(buf) == 0)
- continue;
- /* ignore commented lines */
- if (buf[0] == '#')
- continue;
- if (!hostlist_push(hosts, buf))
- err_exit(true, "hostlist_push error on %s", optarg);
- }
-
- fclose(stream);
-}
-
 int main(int argc, char *argv[])
 {
  CURLM *mh;
@@ -935,9 +897,6 @@ int main(int argc, char *argv[])
  err_exit(true, "hostlist_create error on %s", optarg);
  }
  break;
- case 'f': /* --hostsfile */
- readhostsfile(optarg);
- break;
  case 'H': /* --header */
  header = xstrdup(optarg);
  break;