exchange: switch to usual way of testing for bundle2-ness
We used safehasattr() in one place, but we use isinstance() for this
everywhere else, so switch to the latter.
--- a/mercurial/exchange.py Fri Jun 16 21:57:22 2017 -0400
+++ b/mercurial/exchange.py Fri Jun 16 22:57:31 2017 -0700
@@ -1731,7 +1731,7 @@
# 'check_heads' call wil be a no-op
check_heads(repo, heads, 'uploading changes')
# push can proceed
- if not util.safehasattr(cg, 'params'):
+ if not isinstance(cg, bundle2.unbundle20):
# legacy case: bundle1 (changegroup 01)
with repo.lock():
r = cg.apply(repo, source, url)