Use TldSpecificLogicProxy to fetch renew price in DomainRenewFlow

The renew flow was still using PricingEngineProxy directly, meaning that it did not pick up on any TLD-specific pricing logic. Fixed this, and added tests to make sure.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=136757922

javatests/google/registry/flows/domain/DomainRenewFlowTest.java

@@ -613,11 +613,20 @@ public class DomainRenewFlowTest extends ResourceFlowTestCase<DomainRenewFlow, D
     runFlow();
   }
 
+  @Test
+  public void testFailure_flags_feeMismatch() throws Exception {
+    setEppInput("domain_renew_flags.xml", ImmutableMap.of("FEE", "11"));
+    persistDomain();
+    thrown.expect(FeesMismatchException.class);
+    runFlow();
+  }
+
   @Test
   public void testSuccess_flags() throws Exception {
-    setEppInput("domain_renew_flags.xml");
+    setEppInput("domain_renew_flags.xml", ImmutableMap.of("FEE", "42"));
     persistDomain();
     thrown.expect(TestExtraLogicManagerSuccessException.class, "renewed");
     runFlow();
   }
+
 }

javatests/google/registry/flows/domain/testdata/domain_renew_flags.xml

@@ -3,11 +3,17 @@
     <renew>
       <domain:renew
        xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
-        <domain:name>example.flags</domain:name>
+        <domain:name>create-42.flags</domain:name>
         <domain:curExpDate>2000-04-03</domain:curExpDate>
-        <domain:period unit="y">5</domain:period>
+        <domain:period unit="y">1</domain:period>
       </domain:renew>
     </renew>
+    <extension>
+      <fee:renew xmlns:fee="urn:ietf:params:xml:ns:fee-0.6">
+        <fee:currency>USD</fee:currency>
+        <fee:fee>%FEE%</fee:fee>
+      </fee:renew>
+    </extension>
     <clTRID>ABC-12345</clTRID>
   </command>
 </epp>

javatests/google/registry/model/domain/TestExtraLogicManager.java

@@ -58,6 +58,15 @@ public class TestExtraLogicManager implements RegistryExtraFlowLogic {
     }
   }
 
+  /**
+   * Gets the flags to be used in the EPP flags extension for info commands.
+   *
+   * <p>The test extra logic manager uses domain names differently for info commands than for other
+   * flows. In other flows, the test logic needs returns (via the success exception) the flags found
+   * in the incoming message. But for info commands, there aren't any incoming flags, only outgoing
+   * ones. So we need to specify the flags using a dummy domain name; those flags can then be
+   * inserted into the outgoing info response.
+   */
   @Override
   public Set<String> getExtensionFlags(
       DomainResource domainResource, String clientId, DateTime asOfDate) {