sandbox: ed25519 key creating failed

tor 0.2.7.5 (x86-64) failed to create ed25519 key and stop when sandbox/seccomp support is enabled

sandbox_intern_string(): Bug: No interned sandbox parameter found for /var/lib/tor/data/keys/ed25519_signing_secret_key_encrypted (on Tor 0.2.7.5 )
sandbox_intern_string(): Bug: No interned sandbox parameter found for /var/lib/tor/data/keys/ed25519_signing_public_key (on Tor 0.2.7.5 )
Could not open "/var/lib/tor/data/keys/ed25519_signing_public_key": Permission denied

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