Commits on Aug 18, 2023

1. storage: allow to choose rebalancer location …

   Currently people struggle to find the rebalancer location because
   it is unclear where it is spawned automatically (on the master
   with minimal uuid).
   
   The patch allows to choose in the configuration where the
   rebalancer should work and whether it should work at all.
   
   Closes #278
   
   @TarantoolBot document
   Title: vshard: cfg to choose rebalancer mode and location
   
   There are 2 new config options:
   
   - Root option 'rebalancer_mode'. It can have one of the following
     values:
     - 'auto' - works like now. The rebalancer is selected as the
     master with the minimal UUID;
     - 'off' - rebalancer won't be active at all;
     - 'manual' - need to manually mark the node where the rebalancer
     should be spawned. The selection happens in the config.
   
     Default is 'auto'.
   
   - Instance option 'rebalancer'. It can be true or false. At most
     one instance in the config can have it set to true. If the
     rebalancer mode is 'manual' and none of the instances have this
     flag true, then the rebalancer won't be started anywhere. This
     option is ignored when the mode is not 'manual'. Default is
     false.

   

   Gerold103 committed Aug 18, 2023
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