[plugintools] fix size limiting in addCopySpecLimit

The backport of 029e99a did not preserve the correct behaviour
for addCopySpecLimit in sos-2.2. A missing break and incorrect
indentation of the collectExtOutput() used to obtain the 'tailed'
version of the file caused the tailing to be incorrectly applied
to all candidate files.
[ds] use correct sos-2.x logging API
[ds] add collection of ds admin server configuration
[ldap] ensure /etc/openldap/ content is collected
[plugintools] preserve permissions on directories containing links