YAMAHA_AVR: execute all HTTP requests now non-blocking


git-svn-id: svn://svn.code.sf.net/p/fhem/code@5996 2b470e98-0d58-463d-a4d8-8e2adae1ed80
YAMAHA_AVR: harmonize log output


git-svn-id: svn://svn.code.sf.net/p/fhem/code@5997 2b470e98-0d58-463d-a4d8-8e2adae1ed80