Recommended update for shadowsocks-libev

This update for shadowsocks-libev fixes the following issues:

- Set permissions as 640 for /etc/shadowsocks (boo#1216372)
- run systemd service as a dedicated user and group (Fix boo#1216372 and boo#1216373)

Fixed bugs
bnc#1216373
VUL-0: shadowsocks-rust: systemd services run unnecessarily as root with full privileges
bnc#1216372
VUL-0: shadowsocks-rust: in /etc/shadowsocks potentially security sensitive configuration files are world-readable
Selected Binaries
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