WebSearch: improve detection of record owners

* If CFG_CERN_SITE, consider the possibility of the owner
  of a record being an egroup, defined as 'foo@cern.ch'
  insted of 'foo [CERN]'.

Signed-off-by: Ludmila Marian <ludmila.marian@gmail.com>
Merge pull request #13 from ludmilamarian/master-websearch-record-owners

WebSearch: improve detection of record owners