GUI-1231: VPC support for scaling group wizard and detail page

https://eucalyptus.atlassian.net/browse/GUI-1231
https://eucalyptus.atlassian.net/browse/GUI-1232
We should eliminate the duplicate code by building up the params list in the if/else condition and passing those to the AutoScalingGroup constructor.  See my comment in #891 where I recommend how to avoid duplicate code in the run_instances() call