Change esi client loading to on-demand in eveonline module

allianceauth/eveonline/providers.py

@@ -151,9 +151,18 @@ class EveProvider(object):
 
 class EveSwaggerProvider(EveProvider):
     def __init__(self, token=None, adapter=None):        
-        self.client = esi_client_factory(token=token, spec_file=SWAGGER_SPEC_PATH)
+        self._client = None
+        self._token = token
         self.adapter = adapter or self
 
+    @property
+    def client(self):
+        if self._client is None:
+            self._client = esi_client_factory(
+                token=self._token, spec_file=SWAGGER_SPEC_PATH
+            )
+        return self._client
+
     def __str__(self):
         return 'esi'