IVSSwitch: support opts constructor parameter

This parameter is already supported by the other switch classes.
Merge pull request #210 from rlane/ivs-opts

IVSSwitch: support opts constructor parameter
Add --zip option to archive VM.
adding runner to mininet/test, added test_walkthrough.py
Merge branch 'master' of github.com:mininet/mininet
fixed git download for testRemoteController in test_walkthrough.py
Log failed test output.
Add walkthrough test and log build exceptions
setLogLevel('warning') to avoid test spam
Add arch to vm name, and check kernel for boot arch
Backing out attempt to identify kernel binary format
Clarify log message
Merge pull request #209 from jpoliv/master

Fedora 18+ installation notes