nagios: initial addition of check_vpn module
nagios/check_vpn: more improvements to plugins and also added pptp plugin
nagios/check_vpn: slight fix to pptp plugin, introducing l2tp plugin
nagios/check_vpn: added license
nagios/check_vpn: updated README.md
nagios/check_vpn: some cosmetic changes to README.md
nagios/check_sql: initial import
nagios/check_sql: improved README.md and fixed a spelling mistake
nagios/check_vpn: some refactoring to license headers
nagios/check_vpn: updated README.md with nagios exchange link
nagios/check_vpn: * updated README.md * use specific device as command line argument * fixed duplicate device listing in pptp plugin
nagios/check_vpn: device allocation happening after module loading
nagios/check_vpn: removed double usage of extra arguments in openvpn plugin
nagios/check_vpn: fixed parsing of internet addresses when adding source based routing
nagios/check_vpn: support for tap devices
nagios/check_vpn: fixed ssh.sh to support tap devices
nagios/check_vpn: updated README.md
nagios/check_vpn: fixed spelling mistakes
nagios/check_vpn: fixed bug for xl2tpd not using correct device number
nagios/check_vpn: improved _is_vpn_up functions in all plugins and removed the 'sleep 15' delay in pptp