Implement hashCheck for filewriter. The file put on the storage will be
extended by the hash. It is compatible with the hash the writer ander
reader are using.
Change HashUtil to throw exception instead of system.out'ing it, so it
can be properly logged by higher classes
Merge pull request #65 from ywang19/master

use atomic integer to replace synchronized primitive to avoid performance penalty, and avoid number holes in next().
add open document format document for revising
Merge pull request #63 from Niklas974/hashcheck-filewriter

Hashcheck filewriter
add system bundles required
Merge branch 'master' of https://github.com/intel-cloud/cosbench
Merge https://github.com/intel-cloud/cosbench into 0.3.2.0
Merge branch '0.3.2.0' of https://github.com/intel-cloud/cosbench into 0.3.2.0
revert swift bundle
Merge branch '0.3.2.0' of https://github.com/intel-cloud/cosbench into 0.3.2.0
add nio client constructor to control concurrency