If insert makes use of DEFAULT value of NOW, make sure to evaluate NOW on every insert.  Avoid serializing default values for columns that will be explicitly set.
Merge branch 'master' into ENG-6755-default-now
Make changes related to Xin's feedback.  Move tests from
TestSqlInsertSuite to TestFunctionsSuite, where there is existing
tests for DEFAULT NOW.
Merge pull request #1589 from VoltDB/ENG-6755-default-now

If insert makes use of DEFAULT value of NOW, make sure to evaluate NOW o...