environs/config: make CA cert optional

environs/ec2/config_test.go

 package ec2
 
 import (
         "io/ioutil"
         "launchpad.net/goamz/aws"
         . "launchpad.net/gocheck"
         "launchpad.net/goyaml"
         "launchpad.net/juju-core/environs"
         "launchpad.net/juju-core/environs/config"
+        "launchpad.net/juju-core/testing"
         "os"
         "path/filepath"
         "strings"
 )
 
 // Use local suite since this file lives in the ec2 package
 // for testing internals.
 type ConfigSuite struct {
         savedHome, savedAccessKey, savedSecretKey string
 }
@@ skipping 22 matching lines @@
         firewallMode config.FirewallMode
         err          string
 }
 
 type attrs map[string]interface{}
 
 func (t configTest) check(c *C) {
         envs := attrs{
                 "environments": attrs{
                         "testenv": attrs{
-                                "type": "ec2",
+                                "type":           "ec2",
+                                "ca-cert":        testing.CACertPEM,
+                                "ca-private-key": testing.CAKeyPEM,
                         },
                 },
         }
         testenv := envs["environments"].(attrs)["testenv"].(attrs)
         for k, v := range t.config {
                 testenv[k] = v
         }
         if _, ok := testenv["control-bucket"]; !ok {
                 testenv["control-bucket"] = "x"
         }
@@ skipping 200 matching lines @@
         }
 }
 
 func (s *ConfigSuite) TestMissingAuth(c *C) {
         os.Setenv("AWS_ACCESS_KEY_ID", "")
         os.Setenv("AWS_SECRET_ACCESS_KEY", "")
         test := configTests[0]
         test.err = "environment has no access-key or secret-key"
         test.check(c)
 }