LU-6070 libcfs: provide separate buffers for libcfs_*2str()

LU-6070 libcfs: provide separate buffers for libcfs_*2str()

Provide duplicates with separate buffers for libcfs_*2str() functions.

Replace libcfs_nid2str() with libcfs_nid2str_r() function in critical
places.

Provide buffer size for nf_addr2str functions.

Use __u32 as nf_type always

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I7505271954745d1b1e288ef4e09a7f52bd970536
Reviewed-on: http://review.whamcloud.com/13185
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>