posix: use the correct op_errno

Problem:
If readdir/fstat was performed on a directory that was removed,
posix_fd_ctx_get() fails with ENOENT but we incorrectly use the ret
value (-1 in this case) as op_errno, logging "Operation not permitted"
messages in the brick logs. Also in case of fstat, the -1 op_errno was
also propagated to the client via stack unwind, causing the message to
appear in protocol/client logs as well.

Fix:
Use the right op_errno in readdir, fstat and writev.
A̶l̶s̶o̶,̶ ̶i̶f̶ p̶o̶s̶i̶x̶_̶f̶d̶_̶c̶t̶x̶_̶g̶e̶t̶(̶)̶ ̶f̶a̶i̶l̶e̶d̶ ̶w̶i̶t̶h̶ ̶E̶N̶O̶E̶N̶T̶,̶ ̶c̶o̶n̶v̶e̶r̶t̶ ̶i̶t̶ ̶i̶n̶t̶o̶ ̶E̶B̶A̶D̶F̶ ̶b̶e̶c̶a̶u̶s̶e̶ ̶E̶N̶O̶E̶N̶T̶
i̶s̶ ̶n̶o̶t̶ ̶a̶ ̶v̶a̶l̶i̶d̶ ̶e̶r̶r̶o̶r̶ ̶f̶o̶r̶ ̶a̶n̶ ̶f̶d̶ ̶o̶p̶e̶r̶a̶t̶i̶o̶n̶.̶ Don't do this as it breaks
DHT.See 17565

> Reviewed-on: https://review.gluster.org/17414
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
> Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Amar Tumballi <amarts@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
(cherry picked from commit de92c363c95d16966dbcc9d8763fd4448dd84d13)

Change-Id: Ie43c0789d5040ec73b7cf885d015a183b8c64d70
BUG: 1460661
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: https://review.gluster.org/17517
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

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