Fix response body of /3pid/bind to match spec

- synapse did not check/validate the response as per spec until 0.99.5 it seems
- mxisd was never compliant also

src/test/java/io/kamax/mxisd/test/MxisdDefaultTest.java

@@ -33,11 +33,7 @@ public class MxisdDefaultTest {
 
     @Test
     public void defaultConfig() {
-        MxisdConfig cfg = new MxisdConfig();
-        cfg.getMatrix().setDomain(domain);
-        cfg.getKey().setPath(":memory:");
-        cfg.getStorage().getProvider().getSqlite().setDatabase(":memory:");
-
+        MxisdConfig cfg = MxisdConfig.forDomain(domain).inMemory();
         Mxisd m = new Mxisd(cfg);
         m.start();
 

src/test/java/io/kamax/mxisd/test/MxisdTest.java

@@ -41,10 +41,7 @@ public class MxisdTest {
 
     @Before
     public void before() {
-        MxisdConfig cfg = new MxisdConfig();
-        cfg.getMatrix().setDomain("localhost");
-        cfg.getKey().setPath(":memory:");
-        cfg.getStorage().getProvider().getSqlite().setDatabase(":memory:");
+        MxisdConfig cfg = MxisdConfig.forDomain("localhost").inMemory();
 
         MemoryThreePid mem3pid = new MemoryThreePid();
         mem3pid.setMedium("email");

src/test/java/io/kamax/mxisd/test/crypto/SignatureManagerTest.java

@@ -24,6 +24,7 @@ import com.google.gson.JsonObject;
 import io.kamax.matrix.event.EventKey;
 import io.kamax.matrix.json.GsonUtil;
 import io.kamax.matrix.json.MatrixJson;
+import io.kamax.mxisd.config.MxisdConfig;
 import io.kamax.mxisd.crypto.Signature;
 import io.kamax.mxisd.crypto.SignatureManager;
 import io.kamax.mxisd.crypto.ed25519.Ed25519Key;
@@ -52,7 +53,7 @@ public class SignatureManagerTest {
         KeyStore store = new MemoryKeyStore();
         store.add(key);
 
-        return new Ed25519SignatureManager(new Ed25519KeyManager(store));
+        return new Ed25519SignatureManager(MxisdConfig.forDomain("localhost").inMemory().build(), new Ed25519KeyManager(store));
     }
 
     @BeforeClass