[3181] Moved -f and -F perfdhcp parameters to a DHCPv6 only options.

tests/tools/perfdhcp/command_options.cc

@@ -967,14 +967,6 @@ CommandOptions::usage() const {
         "-E<time-offset>: Offset of the (DHCPv4) secs field / (DHCPv6)\n"
         "    elapsed-time option in the (second/request) template.\n"
         "    The value 0 disables it.\n"
-        "-f<renew-rate>: A rate at which IPv6 Renew requests are sent to\n"
-        "    a server. The sum of this value and release-rate must be equal\n"
-        "    or lower than the rate specified as -r<rate>. If -r<rate> is\n"
-        "    not specified, this parameter must not be specified too.\n"
-        "-F<release-rate>: A rate at which IPv6 Release requests are sent to\n"
-        "    a server. The sum of this value and renew-rate must be equal or\n"
-        "    lower than the rate specified as -r<rate>. If -r<rate> is not\n"
-        "    specified, this parameter must not be specified too.\n"
         "-h: Print this help.\n"
         "-i: Do only the initial part of an exchange: DO or SA, depending on\n"
         "    whether -6 is given.\n"
@@ -1022,6 +1014,14 @@ CommandOptions::usage() const {
         "\n"
         "DHCPv6 only options:\n"
         "-c: Add a rapid commit option (exchanges will be SA).\n"
+        "-f<renew-rate>: A rate at which IPv6 Renew requests are sent to\n"
+        "    a server. The sum of this value and release-rate must be equal\n"
+        "    or lower than the rate specified as -r<rate>. If -r<rate> is\n"
+        "    not specified, this parameter must not be specified too.\n"
+        "-F<release-rate>: A rate at which IPv6 Release requests are sent to\n"
+        "    a server. The sum of this value and renew-rate must be equal or\n"
+        "    lower than the rate specified as -r<rate>. If -r<rate> is not\n"
+        "    specified, this parameter must not be specified too.\n"
         "\n"
         "The remaining options are used only in conjunction with -r:\n"
         "\n"