fix github usercontent hostname.
Changed the place where windows instances are expected to keep their encrypted administrator password
Merge pull request #381 from axsh/windows-password-path-change

windows password path
Merge remote-tracking branch 'origin/master' into rewrite-netfilter
Renamed the 'security' chains to 'rules'
Some code cleanup in the have_applied_vnic matcher
Took care of some code duplication in the netfilter related rspec matchers