Respect 3PID session policy for remote sending with phone numbers

src/main/java/io/kamax/mxisd/session/SessionMananger.java

@@ -196,7 +196,7 @@ public class SessionMananger {
         storage.updateThreePidSession(session.getDao());
         log.info("Session {} has been validated locally", session.getId());
 
-        if (ThreePidMedium.PhoneNumber.is(session.getThreePid().getMedium()) && session.isValidated()) {
+        if (ThreePidMedium.PhoneNumber.is(session.getThreePid().getMedium()) && session.isValidated() && policy.toRemote()) {
             createRemote(sid, secret);
             // FIXME make the message configurable/customizable (templates?)
             throw new MessageForClientException("You will receive a NEW code from another number. Enter it below");

src/main/java/io/kamax/mxisd/threepid/connector/phone/BlackholePhoneConnector.java

@@ -0,0 +1,38 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.threepid.connector.phone;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class BlackholePhoneConnector implements IPhoneConnector {
+
+    @Override
+    public void send(String recipient, String content) {
+        //dev/null
+    }
+
+    @Override
+    public String getId() {
+        return "BLACKHOLE";
+    }
+
+}