protocol/client: fixed registration of saved_fds
protocol/client: fixed registration of saved_fds

In client_open_cbk, client_opendir_cbk the list_add_tail macros were invoked with wrong
ordered arguments, causing the existing registered fd list to get unlinked from the
saved_fds list. The effects of this is far fetched - when transport disconnects, open
fds are no more marked bad as they are not reachable from the saved_fds list. After
reconnection, resumed access on this fd causes reference to invalid fds on the server.
It could appear in the form of 'unresolved fd' error, readdir happening on a file fd,
files reading from other files, etc.

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

BUG: 192 (sefault in posix-readdir)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=192

BUG: 126 (Immediate segfault when used for rootfs)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=126

BUG: 173 ([ glusterfs 2.0.6rc1 ] - "server SEG fault")
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=173

BUG: 194 (Apache+Booster results in inconsistent download size using wget)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=194

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster