Send silent packets when idle with SRTP

Originally we did the same thing with SRTP that we do without SRTP,
which is to simply not send packets when e.g. sleep is called.

At commits d6332397 and
5259814a we enabled sending silence
packets with comfort noise when SRTP is active.  We appear to have
done this for interop purposes; many devices can't handle gaps in the
stream of SRTP packets.

But our current comfort noise implementation doesn't take the codec
rate into account (FS-6291), so on 16kHz codecs the constant we chose
created an annoying level of static between sound file playback.

With this commit we preserve the sending of SRTP packets during idle
periods, but make those packets completely silent.

Thanks-to: Anthony Minessale <anthm@freeswitch.org>

FS-5053 --resolve

src/switch_rtp.c

@@ -3041,7 +3041,7 @@ SWITCH_DECLARE(switch_status_t) switch_rtp_add_crypto_key(switch_rtp_t *rtp_sess
 
 	memset(policy, 0, sizeof(*policy));
 
-	switch_channel_set_variable(channel, "send_silence_when_idle", "400");
+	switch_channel_set_variable(channel, "send_silence_when_idle", "-1");
 
 	switch (crypto_key->type) {
 	case AES_CM_128_HMAC_SHA1_80: