Conform to code in GitLabStatusPush v2.9.4.

I don't fully understand the impact of these API changes, but without
them the status from buildbot upon a successful build was causing gitea
to mark commits with a yellow circle instead of a green checkmark.
Since GiteaStatusPush was based on GitLabStatusPush in the first place,
I tried making it look more like its ancestor -- and now the commit status
in gitea is working correctly.

buildbot_gitea/reporter.py

@@ -17,6 +17,7 @@ from buildbot.process.results import SUCCESS
 from buildbot.process.results import WARNINGS
 from buildbot.reporters import http
 from buildbot.util import httpclientservice
+from buildbot.warnings import warn_deprecated
 
 import re
 
@@ -27,16 +28,20 @@ class GiteaStatusPush(http.HttpStatusPushBase):
 
     def checkConfig(self, baseURL, token, startDescription=None, endDescription=None,
                     context=None, verbose=False, wantProperties=True, **kwargs):
-        super().checkConfig(wantProperties=wantProperties, **kwargs)
+        super().checkConfig(wantProperties=wantProperties,
+                            _has_old_arg_names={
+                                'builders': False,
+                                'wantProperties': wantProperties is not True
+                            }, **kwargs)
 
     @defer.inlineCallbacks
     def reconfigService(self, baseURL, token,
                         startDescription=None, endDescription=None,
-                        context=None, context_pr=None, verbose=False,
+                        context=None, context_pr=None, verbose=False, wantProperties=True,
                         warningAsSuccess=False, **kwargs):
 
         token = yield self.renderSecrets(token)
-        yield http.HttpStatusPushBase.reconfigService(self, **kwargs)
+        yield super().reconfigService(wantProperties=wantProperties, **kwargs)
 
         self.context = context or Interpolate('buildbot/%(prop:buildername)s')
         self.context_pr = context_pr or \
@@ -90,6 +95,21 @@ class GiteaStatusPush(http.HttpStatusPushBase):
 
     @defer.inlineCallbacks
     def send(self, build):
+        # the only case when this function is called is when the user derives this class, overrides
+        # send() and calls super().send(build) from there.
+        yield self._send_impl(build)
+
+    @defer.inlineCallbacks
+    def sendMessage(self, reports):
+        build = reports[0]['builds'][0]
+        if self.send.__func__ is not GiteaStatusPush.send:
+            warn_deprecated('2.9.0', 'send() in reporters has been deprecated. Use sendMessage()')
+            yield self.send(build)
+        else:
+            yield self._send_impl(build)
+
+    @defer.inlineCallbacks
+    def _send_impl(self, build):
         props = Properties.fromDict(build['properties'])
         props.master = self.master