DRILL-5034: Select timestamp from hive generated parquet always return in UTC
- TIMESTAMP_IMPALA function is reverted to retaine local timezone
- TIMESTAMP_IMPALA_LOCALTIMEZONE is deleted
- Retain local timezone for the INT96 timestamp values in the parquet files while
PARQUET_READER_INT96_AS_TIMESTAMP option is on
Minor changes according to the review
Fix for the test, which relies on particular timezone
close #656
