Change default values for GRPC server settings required by querier to connect to frontend and/or scheduler

[trevorwhitney]

Is your feature request related to a problem? Please describe.
Currently, we always have override the default values for grpc_server_min_time_between_pings and grpc_server_ping_without_stream_allowed in order to allow the queriers to establish a connection with the query frontend or scheduler. I think we should change our defaults to match these new values.

Describe the solution you'd like
New defaults for the following server configs:

grpc_server_min_time_between_pings: '10s',
grpc_server_ping_without_stream_allowed: true,