chore: merge branch 'conformance-fixes' into conformance-fixes-2

Author: feywind

src/index.ts

@@ -515,7 +515,7 @@ export class Bigtable {
     this.customEndpoint = customEndpoint;
 
     let customEndpointBaseUrl: string | undefined;
-    let customEndpointPort = 443;
+    let customEndpointPort: number | undefined;
     let sslCreds: gaxVendoredGrpc.ChannelCredentials | undefined;
 
     if (customEndpoint) {
@@ -528,7 +528,7 @@ export class Bigtable {
     const baseOptions = Object.assign({
       libName: 'gccl',
       libVersion: PKG.version,
-      port: customEndpointPort,
+      port: customEndpointPort || 443,
       sslCreds,
       scopes,
       'grpc.keepalive_time_ms': 30000,