Make it clear that block_same_XXX is in effect.

After upgrading from 7068 to latest trunk (8615), oscam started returning
"no matching reader". I scratched my head a little bit then turned on
debug 1, saw error vague message, grepped in the source and found out
that block_same_name was in effect (my user was named srg and the reader
was named srg).

This commit makes the error message better and shows it instead of hiding
it behind D_TRACE log level. This prevents others from burning themselves
and left wondering why their reader is not matched when they upgrade to
newer oscam version.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8616 4b0bc96b-bc66-0410-9d44-ebda105a78c1