cluster/dht: Unwind with proper op_ret

1. Expected behavior of get_real_filename feature.

A getxattr on a existing dir with glusterfs.get_real_filename:<filename>
as key should result in one of the following things.

a. A value returned for that key having the real filename (a file whose
match is a case insensitive match to the filename passed in key).
b. op_ret = -1 and errno set to ENOENT meaning that no such file exists
under the specified dir in any case.
c. op_ret = -1 and errno set to ENODATA. This is a case assuming no
xlator interprets the glusterfs.get_real_filename key and it get
passed down to the posix xlator. Naturally, posix xlator would not
find any xattr with this key and would return ENODATA. This will be
interpreted specially by the caller as the feature not being supported
by underlying glusterfs.

2. What assumptions are wrong?
Initially the key used to be user.glusterfs.get_real_filename.
In that case, when posix xlator did a getxattr call it would have
received ENODATA as error. However, the key has now changed to
glusterfs.get_real_filename. This leads to a EOPNOTSUPP error instead.

Considering the above information, this is a rewrite of
get_real_filename logic in dht.

Change-Id: I012e9150047fc8563be91b0d112a368ac1cbf598
BUG: 1204140
Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-on: http://review.gluster.org/9956
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: N Balachandran <nbalacha@redhat.com>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

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