Fix MacOS failure

test/kokoro.bat

@@ -17,7 +17,6 @@
 cd /d %~dp0
 cd ..
 
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 .\run-tests.bat

test/kokoro.sh

@@ -17,8 +17,7 @@ set -e
 cd $(dirname $0)/..
 
 # Install gRPC and its submodules.
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 ./packages/grpc-native-core/tools/buildgen/generate_projects.sh
 

tools/release/kokoro-electron.bat

@@ -27,8 +27,7 @@ call npm install -g node-gyp@3
 cd /d %~dp0
 cd ..\..
 
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 set ARTIFACTS_OUT=artifacts
 cd packages\grpc-native-core

tools/release/kokoro-electron.sh

@@ -28,8 +28,7 @@ cd $(dirname $0)/../..
 base_dir=$(pwd)
 
 # Install gRPC and its submodules.
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 pip install mako
 ./packages/grpc-native-core/tools/buildgen/generate_projects.sh

tools/release/kokoro-nodejs.bat

@@ -27,8 +27,7 @@ call npm install -g node-gyp@3
 cd /d %~dp0
 cd ..\..
 
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 set ARTIFACTS_OUT=%cd%\artifacts
 cd packages\grpc-native-core

tools/release/kokoro-nodejs.sh

@@ -28,8 +28,7 @@ cd $(dirname $0)/../..
 base_dir=$(pwd)
 
 # Install gRPC and its submodules.
-git submodule update --init
-git submodule foreach --recursive git submodule update --init
+git submodule update --init --recursive
 
 pip install mako
 ./packages/grpc-native-core/tools/buildgen/generate_projects.sh