Part 1 of thread fd handling fixes. In the new scheme fd_table_entries

for dup-ed fds are shared to ensure proper flag handling.  A refcnt
was added to control when entries should be freed.  Specific changes:

close: don't free entry unless refcnt is zero
dup: rewrite to use new function _thread_fd_table_dup
dup2: rewrite to use new function _thread_fd_table_dup
fcntl: use _thread_fd_table_dup
uthread_fd: initialize thread fd table, searching for dup-ed fds.  Add
function to share _thread_fd_table entries when an fd is dup-ed.
uthread_init: make it readable.   Call fd init functions.

All current regression tests plus the mysql torture test pass.  The
new stdfiles regression test fails (I/O redirection problem). Part
2 is intended to fix that problem

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