Merge pull request #22560 from ericgribkoff/update_pip

Update pip before installing grpcio

tools/internal_ci/linux/grpc_xds_bazel_python_test_in_docker.sh

@@ -25,6 +25,7 @@ cd /var/local/git/grpc
 VIRTUAL_ENV=$(mktemp -d)
 virtualenv "$VIRTUAL_ENV"
 PYTHON="$VIRTUAL_ENV"/bin/python
+"$PYTHON" -m pip install --upgrade pip
 "$PYTHON" -m pip install --upgrade grpcio-tools google-api-python-client google-auth-httplib2 oauth2client
 
 # Prepare generated Python code.

tools/internal_ci/linux/grpc_xds_bazel_test_in_docker.sh

@@ -25,6 +25,7 @@ cd /var/local/git/grpc
 VIRTUAL_ENV=$(mktemp -d)
 virtualenv "$VIRTUAL_ENV"
 PYTHON="$VIRTUAL_ENV"/bin/python
+"$PYTHON" -m pip install --upgrade pip
 "$PYTHON" -m pip install --upgrade grpcio grpcio-tools google-api-python-client google-auth-httplib2 oauth2client
 
 # Prepare generated Python code.

tools/run_tests/helper_scripts/prep_xds.sh

@@ -19,6 +19,7 @@ set -ex
 cd "$(dirname "$0")/../../.."
 
 sudo apt-get install -y python3-pip
+sudo python3 -m pip install --upgrade pip
 sudo python3 -m pip install grpcio grpcio-tools google-api-python-client google-auth-httplib2 oauth2client
 
 # Prepare generated Python code.