opscode/knife-ec2 — pull request #51 by timops (2012-06-29 00:26:12+00:00)
Title: update default availability zone to us-east-1c

when using default 'us-east-1b' availability zone, the following error will be encountered:

ERROR: Fog::Compute::AWS::Error: Unsupported => The requested Availability Zone is currently constrained and we are no longer accepting new customer requests for t1/m1/c1/m2 instance types. Please retry your request by not specifying an Availability Zone or choosing us-east-1a, us-east-1d, us-east-1c.