Change expected output for testcase 'tablesample'
Change expected output for testcase 'tablesample'

Since table gets hash distributed to all datanodes, the sampling results vary
in XL. For a sufficiently large and well distributed table, sample count should
look fairly similar as compared to vanilla PostgreSQL. But since the test works
with a very small table, results look skewed in XL.

(The test still does not pass because the HINT returned by the datanode is not
returned to the frontend client and hence that shows up in the diff. But this
is a different bug and will be fixed separately)

oberstet/postgres-xl,pavanvd/postgres-xl,yazun/postgres-xl,pavanvd/postgres-xl,ovr/postgres-xl,Postgres-XL/Postgres-XL,ovr/postgres-xl,techdragon/Postgres-XL,oberstet/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,yazun/postgres-xl,zeroae/postgres-xl,ovr/postgres-xl,oberstet/postgres-xl,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,ovr/postgres-xl,yazun/postgres-xl,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,pavanvd/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl