xds: Don't end status with '.' in XdsNameResolver (#8958) (#8965)

2a45524 introduced '.' to the end of some status descriptions. We
typically don't end status descriptiosn in periods, but that's minor. In
this case though if the causal status ends in period then the new status
will end in two periods, which could easily be confusing to users.

Co-authored-by: Eric Anderson <ejona@google.com>

xds/src/main/java/io/grpc/xds/XdsNameResolver.java

@@ -723,7 +723,7 @@ public void run() {
             return;
           }
           listener.onError(Status.UNAVAILABLE.withCause(error.getCause()).withDescription(
-              String.format("Unable to load LDS %s. xDS server returned: %s: %s.",
+              String.format("Unable to load LDS %s. xDS server returned: %s: %s",
               ldsResourceName, error.getCode(), error.getDescription())));
         }
       });
@@ -923,7 +923,7 @@ public void run() {
               return;
             }
             listener.onError(Status.UNAVAILABLE.withCause(error.getCause()).withDescription(
-                String.format("Unable to load RDS %s. xDS server returned: %s: %s.",
+                String.format("Unable to load RDS %s. xDS server returned: %s: %s",
                 resourceName, error.getCode(), error.getDescription())));
           }
         });

xds/src/test/java/io/grpc/xds/XdsNameResolverTest.java

@@ -432,7 +432,7 @@ public void resolving_encounterErrorLdsWatcherOnly() {
     Status error = errorCaptor.getValue();
     assertThat(error.getCode()).isEqualTo(Code.UNAVAILABLE);
     assertThat(error.getDescription()).isEqualTo("Unable to load LDS " + AUTHORITY
-        + ". xDS server returned: UNAVAILABLE: server unreachable.");
+        + ". xDS server returned: UNAVAILABLE: server unreachable");
   }
 
   @Test
@@ -444,7 +444,7 @@ public void resolving_translateErrorLds() {
     Status error = errorCaptor.getValue();
     assertThat(error.getCode()).isEqualTo(Code.UNAVAILABLE);
     assertThat(error.getDescription()).isEqualTo("Unable to load LDS " + AUTHORITY
-        + ". xDS server returned: NOT_FOUND: server unreachable.");
+        + ". xDS server returned: NOT_FOUND: server unreachable");
     assertThat(error.getCause()).isNull();
   }
 
@@ -458,11 +458,11 @@ public void resolving_encounterErrorLdsAndRdsWatchers() {
     Status error = errorCaptor.getAllValues().get(0);
     assertThat(error.getCode()).isEqualTo(Code.UNAVAILABLE);
     assertThat(error.getDescription()).isEqualTo("Unable to load LDS " + AUTHORITY
-        + ". xDS server returned: UNAVAILABLE: server unreachable.");
+        + ". xDS server returned: UNAVAILABLE: server unreachable");
     error = errorCaptor.getAllValues().get(1);
     assertThat(error.getCode()).isEqualTo(Code.UNAVAILABLE);
     assertThat(error.getDescription()).isEqualTo("Unable to load RDS " + RDS_RESOURCE_NAME
-        + ". xDS server returned: UNAVAILABLE: server unreachable.");
+        + ". xDS server returned: UNAVAILABLE: server unreachable");
   }
 
   @Test