api: bootstrap: drop usage of global authority import

certidude/api/bootstrap.py

@@ -1,14 +1,17 @@
 import logging
 from certidude.decorators import serialize
 from certidude.config import cp
-from certidude import authority, config, const
+from certidude import config, const
 from jinja2 import Template
 
 logger = logging.getLogger(__name__)
 
 class BootstrapResource(object):
+    def __init__(self, authority):
+        self.authority = authority
+
     def on_get(self, req, resp):
         resp.body = Template(open(config.BOOTSTRAP_TEMPLATE).read()).render(
             authority = const.FQDN,
-            servers = authority.list_server_names())
+            servers = self.authority.list_server_names())