pgsql: Factor out encoding specific tests for json

Factor out encoding specific tests for json

This lets us remove the large alternative results files for the main
json and jsonb tests, which makes modifying those tests simpler for
committers and patch submitters.

Backpatch to 9.4 for jsonb and 9.3 for json.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/48a78d80c83f7cd341e9761b5404562db6031c7e

Modified Files
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src/test/regress/expected/json.out | 113 +-
src/test/regress/expected/json_1.out | 1726 -------------
src/test/regress/expected/json_encoding.out | 247 ++
src/test/regress/expected/json_encoding_1.out | 243 ++
src/test/regress/expected/jsonb.out | 131 +-
src/test/regress/expected/jsonb_1.out | 3336 -------------------------
src/test/regress/parallel_schedule | 2 +-
src/test/regress/serial_schedule | 1 +
src/test/regress/sql/json.sql | 28 +-
src/test/regress/sql/json_encoding.sql | 68 +
src/test/regress/sql/jsonb.sql | 31 +-
11 files changed, 564 insertions(+), 5362 deletions(-)