move enable_localaccount.sh, make pam_offline use it

src/platform/pam_offline/authenticator.cc

Index: src/platform/pam_offline/authenticator.cc
diff --git a/src/platform/pam_offline/authenticator.cc b/src/platform/pam_offline/authenticator.cc
index 084fa781bd36dd27c66e009799035968736aa929..5476520c8d10c1e5ca75457c1d0bfeb7d49542a3 100644
--- a/src/platform/pam_offline/authenticator.cc
+++ b/src/platform/pam_offline/authenticator.cc
@@ -171,6 +171,13 @@ bool Authenticator::TestOneMasterKey(const string &master_key_file,
 }
 
 bool Authenticator::TestAllMasterKeys(const Credentials &credentials) const {
+#ifdef CHROMEOS_PAM_LOCALACCOUNT
+  if (credentials.IsLocalAccount()) {
+    LOG(WARNING) << "Logging in with local account credentials.";
+    return true;
+  }
+#endif
+
   if (system_salt_.empty()) {
     LOG(ERROR) << "System salt not loaded.";
     return false;