daemon: Don't use deprecated json_object_object_get
daemon: Don't use deprecated json_object_object_get

This causes a warning on fedora 21 as this has been deprecated.
This commit switches to the recommended json_object_object_get_ex
replacement.
This function has been available since at least json-c 0.10 which is
the minimum version we require, so we don't need a fallback
version of that function.

joehandzik/libstoragemgmt,lazy404/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,lazy404/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,lazy404/libstoragemgmt,lazy404/libstoragemgmt,libstorage/libstoragemgmt,joehandzik/libstoragemgmt,tasleson/libstoragemgmt,joehandzik/libstoragemgmt,cathay4t/libstoragemgmt,jumitche/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,joehandzik/libstoragemgmt,HP-Scale-out-Storage/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,jumitche/libstoragemgmt,tasleson/libstoragemgmt,tasleson/libstoragemgmt,tasleson/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt