bitbake/uievent: fix queueing of events for xmlrpc before UI has loaded
The recent change to Queue up events before the UI is spawned (in
26eda933379801ef1c8b4b09e67d14f498cd3813) broke the xmlrpc server because the
uievent implementation of BBUIEventQueue expects pickled strings for its
queue_event() method.
This is because the RPC exposed event.send() method must accept pickled
strings, but for xmlrpc event.send() is just mapped to queue_event().
Work around this by adding a send_event method which unpickles strings and
hands them off to queue_event() which can then be used for the remapping.
Signed-off-by: Joshua Lock <josh@linux.intel.com>
