Introduce LobFile format for storing large objects.
Implemented LobFile.Reader, LobFile.Writer classes.
Added a performance test of LobFile reading/writing speed.
Build system: fix cobertura build deps.
Remove unused utility classes from o.a.h.s.io.
Use LobFile for external storage in {B,C}lobRef.
Added LobReaderCache.
Converted BlobRef to read from LobFiles (through LobReaderCache).
LargeObjectLoader writes to LobFiles.
Common code from BlobRef and ClobRef factored out into LobRef abstract
base class.
Updated Test{B,C}lobRef and TestLargeObjectLoader for new external LOB storage.
Updated *ImportMappers to close LargeObjectLoaders when they're done.
Added performance tests to build.
Added script to run perf tests; factored out common logic into config script.
Fixed ivy dependency resolution to use multiple configuration inheritance.
Added LobFileStressTest.
Added readme with instructions to src/perftest directory.
Added CodecMap that abstracts compression codec classes to names.
From: Aaron Kimball <aaron@cloudera.com>
git-svn-id: https://svn.apache.org/repos/asf/incubator/sqoop/trunk@1149897 13f79535-47bb-0310-9956-ffa450edef68
