Update rspec

Author: wchen-r7

spec/support/shared/examples/metasploit/framework/login_scanner/login_scanner_base.rb

@@ -71,7 +71,9 @@
     allow(creds).to receive(:username)
     allow(creds).to receive(:user_file)
     allow(creds).to receive(:userpass_file)
-    allow(creds).to receive(:additional_publics).and_return([])
+    allow(creds).to receive(:prepend_creds).and_return([])
+    allow(creds).to receive(:additional_privates).and_return([])
+    allow(creds).to receive(:additional_publics).and_return(['user'])
     login_scanner.cred_details = creds
   end