PHOENIX-1674 Snapshot isolation transaction support through Tephra

[twdsilva]

@samarthjain@JamesRTaylor
Closed#129 since its missing some files.
I added the review feedback, please +1 if everything looks OK

[twdsilva]

For the last few files that aren't showing up in the diff view , you can view the diffs here
https://patch-diff.githubusercontent.com/raw/apache/phoenix/pull/130.patch

[twdsilva]

Will change the sqlState for this and the following exception.

[samarthjain]

The check in TableRef.equals() isn't complete. It should be something like this:

if (((table.getName() == null && other.table.getName() != null)
||(table.getName() != null && other.table.getName() == null)
|| !table.getName().getString().equals(other.table.getName().getString())))
return false;

[JamesRTaylor]

Instead of using System.currentMillis() in the table name (which will create a new physical table for every test), can you create a TestUtil.getTableName(String prefix, boolean localIndex, boolean mutable, boolean transactional, Integer saltBuckets) and creates a sensible table name like T_LOCAL_MUTABLE_UNSALTED.

[twdsilva]

Will change the check in TableRef.equals to

if ((table.getName() == null && other.table.getName() != null)
|| (table.getName()!=null && !table.getName().getString().equals(other.table.getName().getString()))) return false;