Commits on Sep 23, 2019

1. storage: fix nil pointer panic during replica changes …

   Before this PR there was a bug whereby a command attempting to move a range out
   of a joint config would fail to find a RangeDescriptor for a range because it
   was racing with a merge which destroyed that range. The code used to panic.
   
   This fix is simply detecting the nil and not attempting to move out of a
   joint config on a range that no longer exists. Another slightly less problematic
   but still wrong case was if the merged range had been resplit at the same key.
   In this case we might attempt to modify a different range.
   
   This PR is almost exclusively testing.
   
   Fixes cockroachdb#40877.
   
   Release justification: Fixes a panic.
   
   Release note: None

   

   ajwerner committed Sep 23, 2019
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