devel: update blackbox to use default-date

Blackbox now obeys the 'devel.default-date' option. As a side effect we can
delete the mock for blackblox related tests.

hgext/blackbox.py

@@ -171,7 +171,8 b' def wrapui(ui):'
                 return
             try:
                 ui._bbinlog = True
-                date = util.datestr(None, '%Y/%m/%d %H:%M:%S')
+                default = self.configdate('devel', 'default-date')
+                date = util.datestr(default, '%Y/%m/%d %H:%M:%S')
                 user = util.getuser()
                 pid = '%d' % util.getpid()
                 formattedmsg = msg[0] % msg[1:]

tests/mockblackbox.py

@@ -3,8 +3,7 b' from mercurial import ('
     util,
 )
 
-def makedate():
-    return 0, 0
+# XXX: we should probably offer a devel option to do this in blackbox directly
 def getuser():
     return 'bob'
 def getpid():
@@ -12,6 +11,5 b' def getpid():'
 
 # mock the date and user apis so the output is always the same
 def uisetup(ui):
-    util.makedate = makedate
     util.getuser = getuser
     util.getpid = getpid