res_rtp_asterisk: Reset all settings on module reload

'rtpchecksums' and 'rtcpinterval' are not being reset to their defaults
if they are not present in the updated configuration file.

Change-Id: I1162e40199314d46cf3225d5e1271c4c81176670

res/res_rtp_asterisk.c

@@ -6584,8 +6584,13 @@ static int rtp_reload(int reload)
 		return 0;
 	}
 
+#ifdef SO_NO_CHECK
+	nochecksums = 0;
+#endif
+
 	rtpstart = DEFAULT_RTP_START;
 	rtpend = DEFAULT_RTP_END;
+	rtcpinterval = RTCP_DEFAULT_INTERVALMS;
 	dtmftimeout = DEFAULT_DTMF_TIMEOUT;
 	strictrtp = DEFAULT_STRICT_RTP;
 	learning_min_sequential = DEFAULT_LEARNING_MIN_SEQUENTIAL;