Release of cisco-network-node-utils v1.0.0

• Improved logic in Vtp class to handle the presence or absence of
  'feature vtp' and 'vtp domain' configuration.
• Fixed missing default_timer_throttle_* APIs in RouterOspfVrf class.
• Fixed idempotency and area update issues in interface_ospf class.
• Updated CliError class definition to make it easier to troubleshoot such
  errors when running Puppet modules that use this gem.
• Added dotted-decimal munging for the area getter in interface_ospf.
• Added n9000_sample*.rpm to /tests for use with minitests.
• Updated yum install method to include vrf, fixes minitest issue.
• Extended cisco_interface with the following attributes:
  • encapsulation dot1q
  • mtu
  • switchport trunk allowed and native vlans
  • vrf member
• Move misc READMEs into /docs