improve peercheck in HMInfo

git-svn-id: svn://svn.code.sf.net/p/fhem/code@4647 2b470e98-0d58-463d-a4d8-8e2adae1ed80
fhem.pl: restict notify calls if possible to the NOTIFYDEV device


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4648 2b470e98-0d58-463d-a4d8-8e2adae1ed80