try to fix BSC2707 by temporarily extend the tcp timeout from 0.5 to 2
Merge into master from pull request #12:
BSC 2707 (https://github.com/bigswitch/mininet/pull/12)
Change OVS vendor string to big switch
Revert "Change OVS vendor string to big switch"

This reverts commit 2ba57288d15a06c435e94965d80e4fc988f44c80.
Modify ovs kernel vendor string
Add option to set OVS vendor
Merge remote-tracking branch 'bigswitch/master'