core: replace 'whitelist' with 'allowlist' and 'blacklist' with 'blocklist'

We keep the 'WHITELIST-ONLY' filter type name still as an option in
--filter-policy=[POLICY], but deprecated and with the better
'ALLOWLIST-ONLY' replacement suggested from now on.

plugins/sierra/mm-common-sierra.c

@@ -144,13 +144,13 @@ gcap_ready (MMPortSerialAt *port,
     /* Sierra APPx ports have limited AT command parsers that just reply with
      * "OK" to most commands.  These can sometimes be used for PPP while the
      * main port is used for status and control, but older modems tend to crash
-     * or fail PPP.  So we whitelist modems that are known to allow PPP on the
+     * or fail PPP.  So we allowlist modems that are known to allow PPP on the
      * secondary APP ports.
      */
     if (strstr (response, "APP1")) {
         g_object_set_data (G_OBJECT (probe), TAG_SIERRA_APP_PORT, GUINT_TO_POINTER (TRUE));
 
-        /* PPP-on-APP1-port whitelist */
+        /* PPP-on-APP1-port allowlist */
         if (strstr (response, "C885") ||
             strstr (response, "USB 306") ||
             strstr (response, "MC8790"))