[IMP] runbot_merge: allow invoking bot as @bot and #bot

Before this, the bot would only acknowledge commands of the form

    <botname>: <commands>

but since the bot is an actual user, people regularly use `@<botname>`
as it seems like it should work *and* provides for autocompletion.

Support that, as well as the octothorpe in case users want to pound
robodoo.

Related to odoo/runbot#38

runbot_merge/models/pull_requests.py

@@ -214,7 +214,7 @@ class Project(models.Model):
                         # temp hack: add a delay between staging repositories
                         # in case there's a race when quickly pushing a repo
                         # then its dependency
-                        time.sleep(20)
+                        # time.sleep(20)
 
                     # creating the staging doesn't trigger a write on the prs
                     # and thus the ->staging taggings, so do that by hand
@@ -284,7 +284,7 @@ class Project(models.Model):
 
     def _find_commands(self, comment):
         return re.findall(
-            '^{}:? (.*)$'.format(self.github_prefix),
+            '^[@|#]?{}:? (.*)$'.format(self.github_prefix),
             comment, re.MULTILINE)
 
     def _has_branch(self, name):

runbot_merge/tests/test_basic.py

@@ -1747,6 +1747,28 @@ class TestUnknownPR:
         env['runbot_merge.project']._check_progress()
         assert pr.staging_id
 
+class TestComments:
+    def test_address_method(self, repo, env):
+        m = repo.make_commit(None, 'initial', None, tree={'m': 'm'})
+        repo.make_ref('heads/master', m)
+
+        c1 = repo.make_commit(m, 'first', None, tree={'m': 'c1'})
+        prx = repo.make_pr('title', 'body', target='master', ctid=c1, user='user')
+
+        repo.post_status(prx.head, 'success', 'legal/cla')
+        repo.post_status(prx.head, 'success', 'ci/runbot')
+        prx.post_comment('hansen delegate=foo', user='reviewer')
+        prx.post_comment('@hansen delegate=bar', user='reviewer')
+        prx.post_comment('#hansen delegate=baz', user='reviewer')
+
+        pr = env['runbot_merge.pull_requests'].search([
+            ('repository.name', '=', repo.name),
+            ('number', '=', prx.number)
+        ])
+
+        assert {p.github_login for p in pr.delegates} \
+            == {'foo', 'bar', 'baz'}
+
 def node(name, *children):
     assert type(name) in (str, re_matches)
     return name, frozenset(children)