extend init_group_test timeout to 5s (#51330)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/50662
From: https://circleci.com/api/v1.1/project/github/pytorch/pytorch/10203733/output/105/0?file=true&allocation-id=60022ee190b8596d279f4531-0-build%2F195A7D58 (https://github.com/pytorch/pytorch/commit/e86f941395deefe110c6c233bf90b377542b7ff1)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51330
Reviewed By: izdeby
Differential Revision: D26148618
Pulled By: ezyang
fbshipit-source-id: 708d7522843da2f5c919cf41919e6819f89903e2
