Derive RDAP link paths from the received query

The former method -- a config string -- was cumbersome, as each Nomulus system would have to configure the link base to its own URL.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173567021

java/google/registry/request/FullServletPath.java

@@ -0,0 +1,30 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.request;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import javax.inject.Qualifier;
+
+/**
+ * Dagger qualifier for the HTTP servlet path, prepended with scheme, host and port.
+ *
+ * See {@link javax.servlet.http.HttpServletRequest#getServletPath}
+ */
+@Qualifier
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+public @interface FullServletPath {}