LU-1434 utils: extend wireshark parsing

LU-1434 utils: extend wireshark parsing

Add support for MGS_CONFIG_READ
Add capabilities where they're defined in layout.c
Fix processing of MGS_BULK_PORTAL (not a Lustre packet)
Make use of LUSTRE_BUFFER_LEN everywhere.
Add dissecting of capabilities field
Add dissecting of fld field
Add dissecting of MGS_CONFIG_BODY
Fixed all compiler warnings.
Fixed parsing of get/set (x)attrs

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ic75bb4814570b30a1f1dca19d2f49311294ff2fe
Reviewed-on: http://review.whamcloud.com/5155
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>