refactoring: simplify the semaphorewait logic

The semaphorewait()/waitforthread() logic is usefull for IMAP starting
connections. We actually use it in imapserver only.

This patch removes the over-engineered factorized methods. It tend to simplify
the code by cleaning out a chain of two direct calls with no other processes.

Reviewed-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/threadutil.py

@@ -42,10 +42,6 @@ def semaphorereset(semaphore, originalstate):
     for i in range(originalstate):
         semaphore.release()
         
-def semaphorewait(semaphore):
-    semaphore.acquire()
-    semaphore.release()
-
 class threadlist:
     def __init__(self):
         self.lock = Lock()