Fix a race condition when party changes during lock acquisition
Fix a race condition when party changes during lock acquisition

python-zk/kazoo,harlowja/kazoo,harlowja/kazoo,bsanders/kazoo,jacksontj/kazoo,AlexanderplUs/kazoo,jacksontj/kazoo,AlexanderplUs/kazoo,rockerbox/kazoo,rgs1/kazoo,rockerbox/kazoo,rgs1/kazoo,bsanders/kazoo,python-zk/kazoo,kormat/kazoo,pombredanne/kazoo,kormat/kazoo,tempbottle/kazoo,pombredanne/kazoo,tempbottle/kazoo