Attestation manager and fixes on Connection manager

Added initial tests for the attestation manager

src/main/java/api/test/rest/pojo/schema/Attribute.java

+
+package api.test.rest.pojo.schema;
+
+import com.google.gson.annotations.Expose;
+
+public class Attribute {
+
+    @Expose
+    private String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}