Fix for issue HORNETQ-1158

Adding Host header in HTTP requests to comply with HTTP/1.1
Merge pull request #973 from gaohoward/master

change test temp dir cleanup: do not return false when a file is not deleted. Keep on deleting all the rest.
Allow to change backlog of NettyAcceptor
Merge pull request #976 from normanmaurer/backlog

Allow to change backlog of NettyAcceptor
Merge pull request #974 from mvanhulsentop/master

Fix for issue HORNETQ-1158
checking existing paging store before putting a new one into the map.

This avoids the same paging store being started twice.