adding a read_extactly method in the channel definition and adding a checksum module in the socket backend (Required in order to compile the openflow package)
Revert mistaken push at author's request, for "adding a read_extactly method in the channel definition and adding a checksum module in the socket backend (Required in order to compile the openflow package)"

This reverts commit 145bc17d5aec91634625c7770e4d8eabd0f9a1f0.
added nodelay version of write in flow
Fixed iperf tests to build and run under mirari
verify checksum on incoming tcp packets
Disabled verifying checksum on incoming tcp pkts till checksum offload is done
Merge pull request #38 from balrajsingh/master

Fixed up tests to work with mirari, implemented checksum verification but disabled it for now