Code review comment for lp://staging/~gz/goamz/tests_amazon_region

Reviewers: mp+192269_code.launchpad.net,

Message:
Please take a look.

Description:
Enable running live tests against any EC2 region

There are two stages:
  * Making the test -amazon flag take a region name
  * Looking up real amis with simplestreams and using those in tests

Perhaps leaving the -amazon flag as an enabling bool, and setting a new
flag just for selecting a region that defaults to us-east-1 would be
better.

Both the simplestreams code and required test changes are pretty ugly,
a bigger rewrite would help to clean up the tests.

https://code.launchpad.net/~gz/goamz/tests_amazon_region/+merge/192269

(do not edit description out of merge proposal)

Please review this at https://codereview.appspot.com/14930049/

Affected files (+304, -19 lines):
   A [revision details]
   M ec2/ec2i_test.go
   M ec2/ec2t_test.go
   A testutil/streams.go
   A testutil/streams_test.go
   M testutil/suite.go