Added SMB option : sid_name_snooping.

Added SMB option : sid_name_snooping.

This feature, when enabled through Edit/preferences/protocols/smb,
will look at certain SMB and CIFS related protocols to discover the
mapping between SIDs and their Names.

For those SIDs whose name has been snooped/discovered ethereal will
also add "(<name>)" to the end of the SID when printed in the tree pane
through the function dissect_nt_sid().

Currently the feature is not too exciting since the only thing that packet-smb-sidsnooping.c will look at to build this mapping table is
replies to the LSA/QueryInfoPolicy infolevel 3  packets and thus
discover mappings between a Domain SID and a Domain Name.
In the near future this future will be enhanced to also look at more interesting calls such as LSA/LookupSIDs2 and similar.

svn path=/trunk/; revision=7362