Update hooks-bugzilla to  6e1e659eedc8719a2a0ea0906266738a18c7aa42

(hooks-its at a421db414500141249af7fe4fa4c03e453e902ef)

This change adds an "its-name" property (always "its-bugzilla" for
this plugin) to events, which we can use with the upcoming
its-phabricator to select on which Its an action should take place.

Bug: T169
Change-Id: Id69f28029a89dbfbb94397718d38ef3cfda591f5