Use weakref instead of relying on "del" against threading.local.
Use weakref instead of relying on "del" against threading.local.

mathstuf/fedmsg,cicku/fedmsg,vivekanand1101/fedmsg,maxamillion/fedmsg,pombredanne/fedmsg,chaiku/fedmsg,cicku/fedmsg,pombredanne/fedmsg,maxamillion/fedmsg,fedora-infra/fedmsg,mathstuf/fedmsg,fedora-infra/fedmsg,vivekanand1101/fedmsg,fedora-infra/fedmsg,maxamillion/fedmsg,mathstuf/fedmsg,pombredanne/fedmsg,vivekanand1101/fedmsg,chaiku/fedmsg,chaiku/fedmsg,cicku/fedmsg