Commits on Jan 5, 2022

1. spanconfig: carve empty ranges for pseudo-table IDs …

   This commit is similar in spirit to cockroachdb#73746 in that it gets rid of a
   benign difference between the span configs infrastructure and the system
   config span. Whe nnabling span configs by default (cockroachdb#73876), we observed
   a wide blast radius with respect to test failures. This was in large
   part due to assumptions we've baked in regarding the number of splits we
   should expect at cluster start, often waiting for the same number of
   ranges to form before executing the rest of the test.
   
   The differences between the SystemConfigSpan and the span configs
   infrastructure in how they handled (empty) pseudo table keyspaces makes
   for an annoying large list of tests to adjust manually. Instead we take
   the lazy route and generate empty ranges for pseudo table IDs as we did
   before. We can get rid of this special handling once we actually get rid
   of the system config span, and adjust all these tests accordingly. Doing
   it later is also preferable should we need to revert pieces of cockroachdb#73876
   due to unforeseen instability.
   
   Release note: None

   

   irfansharif committed Jan 5, 2022
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