Ignore errors during stackviz build

This removes the 'set -e' bash option to make sure 89-prepare-stackviz
doesn't cause DIB builds to fail if npm encounters an error. Instead,
errors are caught and either logged or ignored outright and the script
always returns successfully.

Additionally, this adds a 15 minute timeout for the npm install to
prevent any image build failures that would take excessively long.

Change-Id: I5272eac323069a8df8ab64e1cc5d7c0bad9bd879

nodepool/elements/stackviz/install.d/89-prepare-stackviz

@@ -15,18 +15,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# dib-lint: disable=setu setpipefail
+# dib-lint: disable=setu setpipefail sete
 if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
     set -x
 fi
-set -e
 
+STACKVIZ_NPM_TIMEOUT="15m"
 STACKVIZ_DIR=/opt/stackviz
 cp -r /opt/git/openstack/stackviz $STACKVIZ_DIR
 
 cd $STACKVIZ_DIR
 
-npm install
-npm run prod
+timeout $STACKVIZ_NPM_TIMEOUT npm install
+ret=$?
 
-rm -rf node_modules/
+if [[ $ret -eq 0 ]]; then
+    npm run prod && rm -rf node_modules/
+else
+    echo "stackviz build aborted due to npm error"
+    rm -rf $STACKVIZ_DIR
+fi
+
+exit 0