puffs - status report 7

[Tatsiana Severyna]

That was a bug hunting week. I've fixed librefuse so that uninfs is
fully functional (vop_pathconfig and file creation bugs). sshfs
remains broken because it doesn't  use inode numbers. I've also fixed
long standing stack alignment bug in libpuffs, and some more.
I've added workaround to vop_inactive to prevent sleeping with locks
held waiting result from userspace.