This patch address two long-standing issues in u9fs:
First, use of chroot causes complications when a root is specified; chroot requires /etc/^(passwd group) and friends be copied to the new root. This is uneccessary, and is obviated by use of a new function named rootpath.
Second, files created with a default user are owned by the user of the process rather than the default user. This is addressed by issuing a chown after create to reinstate proper permission.
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