Add experiment to test standalone registration service

service/src/main/java/org/whispersystems/textsecuregcm/configuration/RegistrationServiceConfiguration.java

@@ -0,0 +1,49 @@
+package org.whispersystems.textsecuregcm.configuration;
+
+import javax.validation.constraints.NotBlank;
+
+public class RegistrationServiceConfiguration {
+
+  @NotBlank
+  private String host;
+
+  private int port = 443;
+
+  @NotBlank
+  private String apiKey;
+
+  @NotBlank
+  private String registrationCaCertificate;
+
+  public String getHost() {
+    return host;
+  }
+
+  public void setHost(final String host) {
+    this.host = host;
+  }
+
+  public int getPort() {
+    return port;
+  }
+
+  public void setPort(final int port) {
+    this.port = port;
+  }
+
+  public String getApiKey() {
+    return apiKey;
+  }
+
+  public void setApiKey(final String apiKey) {
+    this.apiKey = apiKey;
+  }
+
+  public String getRegistrationCaCertificate() {
+    return registrationCaCertificate;
+  }
+
+  public void setRegistrationCaCertificate(final String registrationCaCertificate) {
+    this.registrationCaCertificate = registrationCaCertificate;
+  }
+}