environs/config: make CA cert optional

environs/open_test.go

 package environs_test
 
 import (
         . "launchpad.net/gocheck"
         "launchpad.net/juju-core/environs"
         _ "launchpad.net/juju-core/environs/dummy"
+        "launchpad.net/juju-core/testing"
 )
 
 type OpenSuite struct{}
 
 var _ = Suite(&OpenSuite{})
 
 func (OpenSuite) TestNewDummyEnviron(c *C) {
         // matches *Settings.Map()
         config := map[string]interface{}{
                 "name":            "foo",
                 "type":            "dummy",
                 "state-server":    false,
                 "authorized-keys": "i-am-a-key",
                 "admin-secret":    "foo",
+                "ca-cert":         testing.CACertPEM,
+                "ca-private-key":  "",
         }
         env, err := environs.NewFromAttrs(config)
         c.Assert(err, IsNil)
         c.Assert(env.Bootstrap(false, nil), IsNil)
 }
 
 func (OpenSuite) TestNewUnknownEnviron(c *C) {
         env, err := environs.NewFromAttrs(map[string]interface{}{
                 "name":            "foo",
                 "type":            "wondercloud",
                 "authorized-keys": "i-am-a-key",
+                "ca-cert":         testing.CACertPEM,
+                "ca-private-key":  "",
         })
         c.Assert(err, ErrorMatches, "no registered provider for.*")
         c.Assert(env, IsNil)
 }