[BUG] Deadlock on create new wire brick

[Marco Giusti]

Steps to reproduce the bug:

 1. # rm -r ~/.virtualbricks*
 2. start virtualbricks
 3. create a new wire

What happens:

The gui freeze on a futex.

Further informations:

On start the gui reports there are some components not found: vde_switch vde_plug vde_cryptcab dpipe vdeterm vde_plug2tap wirefilter vde_router.

[Marco Giusti (marco-giusti)]

The problem is in virtualbricks.gui.gui:270. `brickfactory.newbrick` is
called from the main thread and not from the brickfactory thread (the
method is invoked from the gui), so every calls to
`gtk.gdk.threads_enter()` is destinated to deadlock. Something like:

 lock = threading.Lock()
 with lock: # here is acquired
  with lock: # here the deadlock
   print self.the_meaning_of_life()

Mixing threads is bad, brickfactory is not threadsafe and works only
because just one thread at time is using it but if two threads try to
manipulate it nothing good will happen.

[Marco Giusti (marco-giusti)]

Also the problem is caused brickfactory.py:124, the bricktypes has a
MiXeD case key when only lowercase keys are expected.

[Marco Giusti (marco-giusti)]

 status fixreleased

[Marco Giusti (marco-giusti)]

 status fixcommitted