environs/ec2: rename ImageSpec to instanceSpec

environs/ec2/suite_test.go

 package ec2_test
 
 import (
         "flag"
         . "launchpad.net/gocheck"
+        "launchpad.net/juju/go/environs/ec2"
         "testing"
 )
 
 var regenerate = flag.Bool("regenerate-images", false, "regenerate all data in images directory")
 var amazon = flag.Bool("amazon", false, "Also run some tests on live Amazon servers")
 
 func TestEC2(t *testing.T) {
         if *regenerate {
-                regenerateImages(t)
+                ec2.RegenerateImages(t)
         }
         if *amazon {
                 registerAmazonTests()
         }
         registerLocalTests()
         TestingT(t)
 }