sslutil: remove redundant check of sslsocket.cipher()

We are doing this check in both wrapsocket() and validatesocket().

The check was added to the validator in 4bb59919c905 and the commit
message justifies the redundancy with a "might." The check in
wrapsocket() was added in 0cc4ad757c77, which appears to be part of
the same series. I'm going to argue the redundancy isn't needed.

I choose to keep the check in wrapsocket() because it is working
around a bug in Python's wrap_socket() and I feel the check for
the bug should live next to the function call exhibiting the bug.

mercurial/sslutil.py

@@ -299,8 +299,6 b' def validatesocket(sock, strict=False):'
     host = sock._hgstate['hostname']
     ui = sock._hgstate['ui']
 
-    if not sock.cipher(): # work around http://bugs.python.org/issue13721
-        raise error.Abort(_('%s ssl connection error') % host)
     try:
         peercert = sock.getpeercert(True)
         peercert2 = sock.getpeercert()