Cyberghost fix
- Reads the client key from /gluetun/client.key
- Read the client certificate from /gluetun/client.crt
- Additional checks for client key and client certificate validity
- Fix client key file parsing if environment variable isn't present
Bug fixes
- Fix Shadowsocks UDP logs not showing
- Fix HTTP proxy authentication for some proxy clients requiring the Proxy Authenticate header
Other improvements
- Private Internet Access servers information update