Updated api-version and removed upper bounds wildcards for extension APIs
Ensure that deprecated methods are fully annotated

Found with Google error-prone.
Remove ByteStreams2.asByteSource

This method is dangerous since all ByteSource should provide a new
InputStream on every call to openStream while the method returns the
same InputStream for non-repeatable Payloads.
Ensure that Content-MD5 has 128 bits

Update many tests Content-MD5 headers and ETag responses.
Reset xattr on overwrite in filesystem provider
Address Checkstyle violations
JCLOUDS-699: Properly deprecate OpenStack Nova zonescoped package
JCLOUDS-706: Upgrade Azure API to 2012-02-12

This will allow use of Azure after August 2015:

http://blogs.msdn.com/b/windowsazurestorage/archive/2014/08/05/microsoft-azure-storage-service-version-removal.aspx
Address Checkstyle violations
Improve XML compatibility with trace-level logging

Some providers, notably Azure, include a byte-order mark in their XML
responses.  ParseSax.apply buffers these responses in a String when
users enable trace-level logging to include the response in any thrown
exceptions.  InputSource(InputStream) skips these byte-order marks
while InputSource(Reader) does not, yielding a SAXParseException.
Skip test when filesystem does not have xattr

Addresses regression from a104944 seen on CloudBees.
Add PayloadEnclosing.setPayload(ByteSource)
Replace uses of ByteArrayPayload

Prefer ByteSourcePayload which offers a superset of its functionality.
Note that ByteArrayPayload implicitly set the contentLength while
users of ByteSourcePayload must do so explicitly.
Remove ByteArrayPayload

Callers should use ByteSourcePayload instead.
Ignore non-existent container in deleteContainer

All other blobstore providers allow this operation.  Further this
matches the behavior of TransientStorageStrategy.deleteContainer.
This commit prevents a spurious error message from
deleteContainerOrWarnIfUnable after test suite completion.
Prefer Files.delete(Path) over File.delete

The former throws an exception including the cause if the operation
fails while the latter merely returns a boolean.
JCLOUDS-296: Deprecate Rackspace First-Gen CloudServers
Prefer ByteSource payload

Also use randomByteSource for test input.
JCLOUDS-296: Deprecate Rackspace First-Gen CloudServers
Fail build on checkstyle warnings