infinitepush: use the new function to determine push destination Since 066b8d8f75b8, the push command accept multiple destination. `infinitepush` was not aware of that. We now use the new `urlutil.get_push_paths` function to determine the push destination, fixing the issue. This will also make future evolution of that logic transparent for infinitepush We still disallow push to multiple destinations if infinite push is enabled because I don't know what this means for infinite push. However user will now get a clear error message instead of a crash. Differential Revision: https://phab.mercurial-scm.org/D10379