pybind/mgr/autoscaler: Introduce noautoscale flag

pybind/mgr/autoscaler: Introduce noautoscale flag

`noautoscale` flag is a feature where the
user can choose to flip the switch between
turning autoscale `on` and `off` for all
pools with a single command.

`osd pool set noautoscale` will turn all
autoscale mode`off` for all pools.

`osd pool unset noautoscale` will turn all
autoscale mode `on` for all pools.

Signed-off-by: Kamoltat <ksirivad@redhat.com>
(cherry picked from commit be17f041bab90d8f93c3e52df74cdf6c28b44ef2)

Conflicts:
	src/pybind/mgr/pg_autoscaler/module.py - trivial fix