virtiofsd: passthrough_ll: create new files in caller's context

virtiofsd: passthrough_ll: create new files in caller's context

We need to create files in the caller's context. Otherwise after
creating a file, the caller might not be able to do file operations on
that file.

Changed effective uid/gid to caller's uid/gid, create file and then
switch back to uid/gid 0.

Use syscall(setresuid, ...) otherwise glibc does some magic to change EUID
in all threads, which is not what we want.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>