Refactor: Rename blueprint variable to swagger_blueprint

Because the blueprint variable name also be used when building blueprint
tags, rename it to avoid the confusions.

sanic_openapi/__init__.py

@@ -1,4 +1,4 @@
-from .swagger import blueprint as swagger_blueprint
+from .swagger import swagger_blueprint
 
 __version__ = "0.5.3"
 __all__ = ["swagger_blueprint"]

sanic_openapi/swagger.py

@@ -10,20 +10,20 @@
 from .doc import route as doc_route
 from .doc import route_specs, serialize_schema
 
-blueprint = Blueprint("swagger", url_prefix="/swagger")
+swagger_blueprint = Blueprint("swagger", url_prefix="/swagger")
 
 dir_path = os.path.dirname(os.path.realpath(__file__))
 dir_path = os.path.abspath(dir_path + "/ui")
 
 
 # Redirect "/swagger" to "/swagger/"
-@blueprint.route("", strict_slashes=True)
+@swagger_blueprint.route("", strict_slashes=True)
 def index(request):
-    return redirect("{}/".format(blueprint.url_prefix))
+    return redirect("{}/".format(swagger_blueprint.url_prefix))
 
 
-blueprint.static("/", dir_path + "/index.html", strict_slashes=True)
-blueprint.static("/", dir_path)
+swagger_blueprint.static("/", dir_path + "/index.html", strict_slashes=True)
+swagger_blueprint.static("/", dir_path)
 
 
 _spec = {}
@@ -38,7 +38,7 @@ def remove_nulls(dictionary, deep=True):
     }
 
 
-@blueprint.listener("before_server_start")
+@swagger_blueprint.listener("before_server_start")
 def build_spec(app, loop):
     _spec["swagger"] = "2.0"
     _spec["info"] = {
@@ -96,7 +96,7 @@ def build_spec(app, loop):
     for uri, route in app.router.routes_all.items():
 
         # Ignore routes under swagger blueprint
-        if route.uri.startswith(blueprint.url_prefix):
+        if route.uri.startswith(swagger_blueprint.url_prefix):
             continue
 
         if "static" in route.name:
@@ -244,13 +244,13 @@ def build_spec(app, loop):
     _spec["paths"] = paths
 
 
-@blueprint.route("/swagger.json")
+@swagger_blueprint.route("/swagger.json")
 @doc_route(exclude=True)
 def spec(request):
     return json(_spec)
 
 
-@blueprint.route("/swagger-config")
+@swagger_blueprint.route("/swagger-config")
 def config(request):
     options = {}