Initialize attrlist in FSAL_PROXY.

This fixes a segmentation fault because of unitialized attrlist.
Fix symbols resolution of RPC functions.

For this patch to work properly, we need to build the libntirpc with the -fPIC
flag.

See detailed discussion at
http://sourceforge.net/mailarchive/message.php?msg_id=30740546

and

http://sourceforge.net/mailarchive/message.php?msg_id=30740656
Fix pxy_fsalattr_to_fattr4 of FSAL_PROXY.

Use the fattr_bit field of struct fsal_mask2bit instead of mask.
Fix a NFS4ERR_BAD_SEQID problem of FSAL_PROXY.

No sure if it is a good way to always use seqid 0 here in
COMPOUNDV4_ARG_ADD_OP_OPEN_CREATE. When TCP is negotiating a sequence number,
they start with a random number. But it fix the problem in my test environment.
Another NFS4ERR_BAD_SEQ in FSAL_PROXY.

Not sure if this patch always do the right thing. There is little description
about the seqid of CLOSE operation in RFC3530.
Add status method for FSAL_PROXY.

This patch adds proper 'fsal_status' method to reflect the way open is handled
by proxy FSAL.  It fixes an infinite loop, which is because the default status
method always return FSAL_O_CLOSED.
Merge branch 'fix-proxy' of github.com:brianchenming/nfs-ganesha into fix-proxy