Mock more methods for base_spec

Author: wchen-r7

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

@@ -18,6 +18,9 @@ def self.model_name
     allow(creds).to receive(:username).and_return('user')
     allow(creds).to receive(:user_file)
     allow(creds).to receive(:userpass_file)
+    allow(creds).to receive(:prepended_creds).and_return([])
+    allow(creds).to receive(:additional_privates).and_return([])
+    allow(creds).to receive(:additional_publics).and_return([])
     allow(creds).to receive(:each).and_return(['user', 'pass'])
     allow(creds).to receive(:additional_publics).and_return([])
     creds