Add coverity warning squelching for perfectly safe random() calls

where random is used in non-security-sensitive ways for things like
distributing timer event load

src/accept.c

@@ -1207,8 +1207,10 @@ static int accept_liveupgrade_single(cJSON *client, int *rxerr_map, int rxerr_ma
 	}
 	/* distribute keepalive intervals for the existing old clients
 	 * but send them rather sooner than later */
+	// coverity[dont_call]  // squelch warning: not security sensitive use of random(): load distribution
 	c->keepalive = tick + (random() % (keepalive_interval/2));
 	/* distribute cleanup intervals over the next 2 minutes */
+	// coverity[dont_call]  // squelch warning: not security sensitive use of random(): load distribution
 	c->cleanup = tick + (random() % 120);
 	
 	c->connect_time = time_connect->valueint;

src/aprsc.c

@@ -589,8 +589,10 @@ static void generate_instance_id(void)
 	
 	if (fd < 0) {
 		/* urandom failed for us, use something inferior */
-		for (l = 0; l < INSTANCE_ID_LEN; l++)
+		for (l = 0; l < INSTANCE_ID_LEN; l++) {
+			// coverity[dont_call]  // squelch warning: not security sensitive use of random()
 			s[l] = random() % 256;
+		}
 	}
 	
 	for (l = 0; l < INSTANCE_ID_LEN; l++) {
@@ -883,6 +885,7 @@ int main(int argc, char **argv)
 	
 	time_set_tick_and_now();
 	cleanup_tick = tick;
+	// coverity[dont_call]  // squelch warning: not security sensitive use of random()
 	version_tick = tick + random() % 60; /* some load distribution */
 	startup_tick = tick;
 	startup_time = now;

src/config.c

@@ -548,6 +548,7 @@ int do_peergroup(struct peerip_config_t **lq, int argc, char **argv)
 	/* Configure a listener */
 	li = hmalloc(sizeof(*li));
 	memset(li, 0, sizeof(*li));
+	// coverity[dont_call]  // squelch warning: not security sensitive use of random(): local id
 	li->id = random();
 	li->corepeer = 1;
 	li->name = hstrdup(argv[1]);
@@ -1126,6 +1127,7 @@ int do_listen(struct listen_config_t **lq, int argc, char **argv)
 		l->id = old_l->id;
 	} else {
 		/* new config, assign new id */
+		// coverity[dont_call]  // squelch warning: not security sensitive use of random(): local id
 		l->id = random();
 	}
 	

src/messaging.c

@@ -30,6 +30,7 @@ void messaging_generate_msgid(char *buf, int buflen)
 	int i, c;
 	
 	for (i = 0; i < buflen-1; i++) {
+		// coverity[dont_call]  // squelch warning: not security sensitive use of random(): APRS message-id
 		c = random() % (2*26 + 10); /* letters and numbers */
 		
 		if (c < 10)

src/uplink.c

@@ -430,6 +430,7 @@ int make_uplink(struct uplink_config_t *l)
 	}
 	
 	/* Pick random address to start from */
+	// coverity[dont_call]  // squelch warning: not security sensitive use of random()
 	i = random() % addrc;
 	
 	/* Then lets try making socket and connection in address order */