chore: use zones that are available in all test envs (#78)

* chore: use zones that are available in all test envs

* format

Author: igorbernstein2

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/it/BigtableInstanceAdminClientIT.java

@@ -117,7 +117,8 @@ public void instanceCreationDeletionTest() {
 
     client.createInstance(
         CreateInstanceRequest.of(newInstanceId)
-            .addDevelopmentCluster(newClusterId, "us-east1-b", StorageType.SSD)
+            .addDevelopmentCluster(
+                newClusterId, testEnvRule.env().getPrimaryZone(), StorageType.SSD)
             .setDisplayName("Fresh-Instance-Name")
             .addLabel("state", "readytodelete")
             .setType(Instance.Type.DEVELOPMENT));
@@ -154,7 +155,7 @@ public void clusterCreationDeletionTest() {
     boolean isClusterDeleted = false;
     client.createCluster(
         CreateClusterRequest.of(instanceId, newClusterId)
-            .setZone("us-central1-f")
+            .setZone(testEnvRule.env().getSecondaryZone())
             .setStorageType(StorageType.SSD)
             .setServeNodes(3));
     try {

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/test_helpers/env/AbstractTestEnv.java

@@ -78,6 +78,14 @@ public boolean isDirectPathEnabled() {
     return "bigtable".equals(System.getenv("GOOGLE_CLOUD_ENABLE_DIRECT_PATH"));
   }
 
+  public String getPrimaryZone() {
+    return "us-east1-b";
+  }
+
+  public String getSecondaryZone() {
+    return "us-central1-b";
+  }
+
   void cleanUpStale() {
     cleanupStaleTables();
     if (isInstanceAdminSupported()) {