Add DHCP Protocol/Type constants to the DiscoveryConnection class

[erran-r7]

Example

require 'nexpose'

###
# NOTE: These definitions will no longer be required once the gem has been released with the changes from this pull request.
unless defined?(Nexpose::DiscoveryConnection::Protocol::SERVICE_PROXY)
  Nexpose::DiscoveryConnection::Protocol::SERVICE_PROXY = 'SERVICE_PROXY'
end

unless defined?(Nexpose::DiscoveryConnection::Type::DHCP_SERVICE)
  Nexpose::DiscoveryConnection::Type::DHCP_SERVICE = 'DHCP_SERVICE'
end
#
###

nexpose_connection = Nexpose::Connection.new(hostname, nexpose_user, nexpose_password)

discovery_connection = Nexpose::DiscoveryConnection.new(
  connection_name,
  log_directory,
  cifs_user,
  cifs_password
)
engine = nexpose_connection.engines.find { |connection| connection.name.eql?('Local scan engine') }
discovery_connection.engine_id = engine.id
discovery_connection.protocol = Nexpose::DiscoveryConnection::Protocol::SERVICE_PROXY
discovery_connection.type = Nexpose::DiscoveryConnection::Type::DHCP_SERVICE

# Save a new DHCP discovery connection
discovery_connection.save(nexpose_connection)

# Delete a DHCP discovery connection
discovery_connection.delete(nexpose_connection)

[gschneider-r7]

TODO: Put the example in the wiki somewhere 😄

[gschneider-r7]

Wiki updated, but needs more work https://github.com/rapid7/nexpose-client/wiki/Using-Discovery-Connections