Decrease Node module cache time to avoid errors with out-of-date modules

tools/run_tests/build_artifact_node.bat

@@ -33,6 +33,7 @@ set PATH=%PATH%;C:\Program Files\nodejs\;%APPDATA%\npm
 
 del /f /q BUILD || rmdir build /s /q
 
+call npm cache clean || goto :error
 call npm update || goto :error
 
 mkdir artifacts

tools/run_tests/build_artifact_node.sh

@@ -40,6 +40,7 @@ rm -rf build || true
 
 mkdir -p artifacts
 
+npm cache clean
 npm update
 
 node_versions=( 0.12.0 1.0.0 1.1.0 2.0.0 3.0.0 4.0.0 5.0.0 6.0.0 7.0.0 )

tools/run_tests/pre_build_node.bat

@@ -29,6 +29,5 @@
 
 set PATH=%PATH%;C:\Program Files\nodejs\;%APPDATA%\npm
 
-@rem Expire cache after 1 week
-call npm update --cache-min 604800
-
+@rem Expire cache after 1 day
+call npm update --cache-min 86400

tools/run_tests/pre_build_node.sh

@@ -37,8 +37,8 @@ set -ex
 
 export GRPC_CONFIG=${CONFIG:-opt}
 
-# Expire cache after 1 week
-npm update --cache-min 604800
+# Expire cache after 1 day
+npm update --cache-min 86400
 
 npm install node-gyp-install
 ./node_modules/.bin/node-gyp-install