backend_common: base_url -> base_path, to fix warning in production (#426)
backend_common: base_url -> base_path, to fix warning in production (#426)


garbas/mozilla-releng-services,lundjordan/services,mozilla-releng/services,lundjordan/services,srfraser/services,garbas/mozilla-releng-services,srfraser/services,La0/mozilla-relengapi,La0/mozilla-relengapi,lundjordan/services,srfraser/services,garbas/mozilla-releng-services,srfraser/services,La0/mozilla-relengapi,mozilla-releng/services,La0/mozilla-relengapi,mozilla-releng/services,lundjordan/services,garbas/mozilla-releng-services,mozilla-releng/services