Change Kokoro scripts to use run_tests_matrix.py

tools/internal_ci/linux/grpc_master_sanitizers.sh

@@ -37,12 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f sanitizers linux
-
-# kill port_server.py to prevent the build from hanging
-ps aux | grep port_server\\.py | awk '{print $2}' | xargs kill -9
-
-if [ "$FAILED" != "" ]
-then
-  exit 1
-fi
+tools/run_tests/run_tests_matrix.sh -f sanitizers linux

tools/internal_ci/linux/grpc_portability.sh

@@ -37,13 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f portability linux
-
-# kill port_server.py to prevent the build from hanging
-ps aux | grep port_server\\.py | awk '{print $2}' | xargs kill -9
-
-if [ "$FAILED" != "" ]
-then
-  exit 1
-fi
-
+tools/run_tests/run_tests_matrix.sh -f portability linux

tools/internal_ci/linux/grpc_portability_build_only.sh

@@ -37,4 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f portability linux --build_only
+tools/run_tests/run_tests_matrix.sh -f portability linux --build_only