RocksJava - FindBugs issues

Addressed some FindBugs issues.
[RocksJava] Remove obsolete dbFolder cleanup
[RocksJava] Comparator tests for CF

- Added AbstractComparatorTest.
- Fixed a bug in the JNI Part about Java comparators
[RocksJava] Quality improvements

Summary:
- Addressed some FindBugs issues.
- Remove obsolete dbFolder cleanup
- Comparator tests for CF
 - Added AbstractComparatorTest.
 - Fixed a bug in the JNI Part about Java comparators
- Minor test improvements

Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom package

Reviewers: adamretter, yhchiang, ankgup87

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D29571
Fixed a Lint problem
Integrated changes from D29571
Add -fno-exceptions flag to ROCKSDB_LITE.

Summary: Add -fno-exceptions flag to ROCKSDB_LITE.

Test Plan: make OPT=-DROCKSDB_LITE shared_lib -j32

Reviewers: sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D29901
Merge pull request #422 from fyrz/RocksJava-Quality-Improvements

Rocks java quality improvements