v0.17.1

JuiceFS v0.17.1 is a patch release for v0.17, which has the following changes:

• Return ENOSYS if attr is disabled (#863).
• Ignore unknown flags in setattr() (#862).
• Sort files when list a directory in Java SDK to be compatible with HDFS (#889).
• Upgrade nats-server to v2.2+ to address CVE-2021-3127 (#893).
• Enable metrics for S3 gateway (#897).
• Fixed WebDAV backend (#899).
• Refresh cache once new attributes found (#902).
• Upgrade dgrijalva/jwt-go to golang-jwt/jwt to address CVE-2020-26160 (#903)
• Fixed parent of renamed files/dirs (#905).
• Fixed chunk deletions for SQL engine (#904)
• Upgrade gjson to fix CVE-2021-42836 (#912).

Thanks to contributions from @SandyXSD @tangyoupeng @davies @zhijian-pro @chiyutianyi !