environs/config: make CA cert optional

environs/openstack/export_test.go

+package openstack
+
+import (
+        "launchpad.net/juju-core/trivial"
+        "net/http"
+)
+
+func init() {
+        http.DefaultTransport.(*http.Transport).RegisterProtocol("file", http.NewFileTransport(http.Dir("testdata")))
+}
+
+var origMetadataHost = metadataHost
+
+func UseTestMetadata(local bool) {
+        if local {
+                metadataHost = "file:"
+        } else {
+                metadataHost = origMetadataHost
+        }
+}
+
+var originalShortAttempt = shortAttempt
+var originalLongAttempt = longAttempt
+
+// ShortTimeouts sets the timeouts to a short period as we
+// know that the testing server doesn't get better with time,
+// and this reduces the test time from 30s to 3s.
+func ShortTimeouts(short bool) {
+        if short {
+                shortAttempt = trivial.AttemptStrategy{
+                        Total: 0.25e9,
+                        Delay: 0.01e9,
+                }
+                longAttempt = shortAttempt
+        } else {
+                shortAttempt = originalShortAttempt
+                longAttempt = originalLongAttempt
+        }
+}
+
+var ShortAttempt = &shortAttempt