[PATCH] schema: run on_alter_space triggers from space_cache_replace

[Vladimir Davydov]

On Wed, Mar 27, 2019 at 04:30:06PM +0300, Vladimir Davydov wrote:
> We call it after each invocation of space_cache_replace() anyway.
> Panic on error as space_cache_replace() isn't supposed to fail.
> Remove empty on_create_space_commit() while we are at it.
> 
> Follow-up commit 082cffca4dba ("Synchronize lua schema update with
> space cache").
> ---
>  src/box/alter.cc  | 21 ---------------------
>  src/box/schema.cc |  9 ++++++---
>  2 files changed, 6 insertions(+), 24 deletions(-)

Trivial. Committed to master.