[SPARK-4419] Upgrade snappy-java to 1.1.1.6

This upgrades snappy-java to 1.1.1.6, which includes a patch that improves error messages when attempting to deserialize empty inputs using SnappyInputStream (see xerial/snappy-java#89).

We previously tried up upgrade to 1.1.1.5 in #2911 but reverted that patch after discovering a memory leak in snappy-java.  This should leak have been fixed in 1.1.1.6, though (see xerial/snappy-java#92).

Author: Josh Rosen <joshrosen@databricks.com>

Closes #3287 from JoshRosen/SPARK-4419 and squashes the following commits:

5d6f4cc [Josh Rosen] [SPARK-4419] Upgrade snappy-java to 1.1.1.6.
[SPARK-4426][SQL][Minor] The symbol of BitwiseOr is wrong, should not be '&'

The symbol of BitwiseOr is defined as '&' but I think it's wrong. It should be '|'.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #3284 from sarutak/bitwise-or-symbol-fix and squashes the following commits:

aff4be5 [Kousuke Saruta] Fixed symbol of BitwiseOr