I have submitted this form like they said https://developer.apple.com/contact/network-extension/
and then I got email from apple
Please note that as of November 10, 2016 this process is not required for developers who wish to use App Proxy, Content Filter, or Packet Tunnel AP
and then I have enabled network extensions in
https://developer.apple.com/account/ios/identifier/bundle
but when I add com.apple.developer.networking.hotspothelper in entitlements and compile my Xcode I got this error message
The executable was signed with invalid entitlements. The entitlements specified in your application’s Code Signing Entitlements file are invalid, not permitted, or do not match those specified in your provisioning profile. (0xE8008016).