Add task to copy zone file for local time
Add tasks to synchronize time with commands
Use shell command instead of command
Add specs for IPv6 networking
Add tasks to disable IPv6 networking

- sysctl.conf
- disable ip6tables
Merge branch 'disable-ipv6'
Add specs for unused services
Add tasks to disable unused services
Merge branch 'disable-services'
Add specs for Node.js and npm
Node.js requires OpenSSL 16.el6_5.15
Add tasks to install Node.js and npm