Item12670: WikiName clash when cacheUserFromEntry from checkCacheForLoginName is not handled

in Foswiki::Contrib::LdapContrib::checkCacheForLoginName(), if:

1. The $LoginName is unknown ...
2. and the LDAP entry for the $LoginName is fetched,
3. and cacheUserFromEntry is run on the LDAP entry,
4. and cacheUserFromEntry returns 0 because the calculated WikiName is already found in in cache,

Then the clash seems to be forgotten about. Adding the following to checkCacheForLoginName() would help:

     $this->cacheUserFromEntry($entry, $data, \%wikiNames, \%loginNames);
+    $this->resolveWikiNameClashes($data, \%wikiNames, \%loginNames);

(Not tested, just found when going through code)

-- TerjeNessAndersen - 27 Nov 2013

Fix released in v6.21

-- MichaelDaum - 12 Jan 2015

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