CDAP-988 introducing a setting for enabling writes to datasets
through Hive, which will be false by default. This will always
be false for CDH4, due to problems in that Hive version with using
unmanaged tables with custom output formats.
CDAP-988 remove unneeded changes.
CDAP-988 change default for hive writes to true to be consistent
with previous behavior. Also adding a known issue to the release
notes.
Merge pull request #820 from caskdata/hotfix/CDAP-988-cdh4-explore-fix

Hotfix/cdap 988 cdh4 explore fix