performance/stat-prefetch: fix memory leaks

- sp_cache_get_inode uses fd_lookup which internally increases the refcount of
    fd by 1. This needs to be unrefed once we get the cache.
  - for directories, stat is stored in the inode context in sp_lookup_cbk.
    but, while doing so, no check was being done for the presence of context
    in inode, resulting in leak of memory equal to sizeof (struct stat) when
    multiple lookups happened on the directory. stat was needed to serve the
    postparent member during lookup. postparent stat is needed only in releases
    having NFS related changes and hence removing code present to get
    postparent.
  - path constructed in sp_readdir was not freed.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 257 (Backport stat-prefetch to 2.0)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=257

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