NetDB v1.6 Release

NetDB v1.6 is available:

What's New in v1.6:
- Added SSH support to scraper scripts with optional telnet fallback support
- Added backup and restore operations to netdbctl
- Added delete methods to updatenetdb.pl
- Added optional NAC registration data to the database (must use Bradford NAC or a custom data source)
- Added mac_format display options to both config files to change the default MAC display format and allow
CLI and CGI override options
- Added quoted CSV file format option to the CLI
- Added support for 6500s running VSS code and NX-OS support for Nexus devices