Upgrade NodeJS to v8.0.0 (#2841)

toolset/setup/linux/webservers/nodejs.sh

@@ -2,7 +2,7 @@
 
 fw_installed node && return 0
 
-VERSION="7.10.0"
+VERSION="8.0.0"
 
 fw_get -O http://nodejs.org/dist/v$VERSION/node-v$VERSION-linux-x64.tar.gz
 fw_untar node-v$VERSION-linux-x64.tar.gz