Alexander Kuzmenkov 063a9dae29 Improve cost model for data node scans
1) Simplify the path generation for the parameterized data node scans.
1) Adjust the data node scan cost if it's an index scan, instead of always
   treating it as a sequential scan.
1) Hard-code the grouping estimation for distributed hypertable, instead
   of using the totally bogus per-column ndistinct value.
1) Add the GUC to disable parameterized
data node scan.
1) Add more tests.
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