Upgrade to logback 1.1.2

Changelog:
http://logback.qos.ch/news.html
JCLOUDS-410: Remove InputStreamSupplierPayload

ByteSourcePayload replaces this.  jclouds 1.7 deprecated
InputStreamSupplierPayload and Guava 16 deprecated InputSupplier
itself.
JCLOUDS-417: Remove ConsumeOnCloseInputStream

ConsumeOnCloseInputStream can potentially perform a copy in finalize()
if the stream was not closed properly.
JCLOUDS-417: Test closing a stream w/o reading it
Enforce correct MD5 for local blobstores

Matches behavior of real blobstores.
Remove unneeded InputSupplier helper

Also convert byte[] to HashCode.
JCLOUDS-622: Deprecate Strings2.toString

Guava 16 deprecated InputSupplier.
Improve use of ByteSource with test resources

This commit ensures proper resource cleanup, simplifies
initialization, and paves the way for purely synthetic inputs in a
subsequent commit.
Address Checkstyle violations
JCLOUDS-622: remove calls to InputSupplier methods

Guava 16 deprecated these methods and Guava 18 will remove them.
JCLOUDS-629: SshjSshClient Payload without length

sshj treats -1 as an unknown length and uses a less efficient copying
mechanism.
JCLOUDS-40: Unasync OpenStack Nova API
JCLOUDS-625: Set VolumeBuilder id to nullable in VolumeImpl

VolumeBuilder does not allow null id while VolumeImpl allows it to be nullable.
Improve use of ByteSource
Reduce Swift integration test input size

Previously testMultipartChunkedFilenames uploaded 55 MB and now it
uploads 5 MB.
[JCLOUDS-474] refactor SoftLayer support
JCLOUDS-40: Unasync Rackspace Cloud Identity
JCLOUDS-622: Remove most vestiges of InputSupplier

Guava 16 deprecated InputSupplier and a future release will remove it.