Propagate Flags from setstat packet to request
Propagate Flags from setstat packet to request

Had file attributes, but not the flags which are required for the
attributes to be meaningful. The stats stuff in the request-server is
very simplistic, but I want it to be able to be used even if a PITA.

fuchsia-mirror/third_party-github.com-pkg-sftp,pkg/sftp,fuchsia-mirror/third_party-pkg-sftp,ScriptRock/sftp