remove hardcoded defaults from spec

ensure that we test for there being defaults in the underlying scanner

spec/lib/metasploit/framework/login_scanner/snmp_spec.rb

@@ -36,9 +36,7 @@ describe Metasploit::Framework::LoginScanner::SNMP do
     before(:each) do
       snmp_scanner.host = '127.0.0.1'
       snmp_scanner.port = 161
-      snmp_scanner.connection_timeout = 1
       snmp_scanner.retries = 0
-      snmp_scanner.version = 'all'
       snmp_scanner.stop_on_success = true
       snmp_scanner.cred_details = detail_group
     end