make exception handling syntax consistent

Update exception handling syntax to use the modern style:
except ExcType as localvar

(Bitbake rev: dbf5f42b06bef81749b13aa99945cc1292a6676d)

Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/server/process.py

@@ -64,7 +64,7 @@ class EventAdapter():
     def send(self, event):
         try:
             self.queue.put(event)
-        except Exception, err:
+        except Exception as err:
             print("EventAdapter puked: %s" % str(err))
 
 
@@ -168,7 +168,7 @@ class ProcessServer(Process):
                 exitcode = 0
             finally:
                 util._exit_function()
-        except SystemExit, e:
+        except SystemExit as e:
             if not e.args:
                 exitcode = 1
             elif type(e.args[0]) is int: