Part of effort to make agoclient.cpp slimmer

This was broken quite a while back (9aafd93e)

Also update test_agorpc.py a bit

I.e. if not inited, rooms would be omitted from response instead of being an empty object.

Qpid removal

See merge request !37

This reverts commit 11b65f05

# Conflicts:
#   devices/MySensors/agoMySensors.cpp

Fix error in cgi that makes impossible data saving. Also improve error display after cgi execution (for favorites at least)

Update squeezebox device to new response format. Fix issue when loading mediainfos during ui startup

Otherwise it gets interpreted as char and badly printed

Gcc8 complained: division 'sizeof (char**) / sizeof (char*)' does not compute the number of array elements [-Werror=sizeof-pointer-div]

Also only free memory if retval is zero, in error cases rrd_fetch_r frees memory itself.

Also close file handle..