* Update plugins/hooks from branch 'stable-2.15'
to 491c5ddf0e3892ffe684cc825a406ef56744a458
- Merge "Include 'submit' hook in listing of hooks run synchronously" into stable-2.15
- Include 'submit' hook in listing of hooks run synchronously
Appears to be omitted on config.md - see the hooks.md where this is listed
as hook with an ability to prevent a submit, before this has happened.
Change-Id: I446f05c1f2372c92b3bb3dcf2d81a64958c2c3b6