commit cba3b76aecb09f3d9432d7bbcaaf6090a5dd2143
author Suharsh Sivakumar <suharshs@google.com> Tue Feb 09 22:20:33 2016 -0800
committer Suharsh Sivakumar <suharshs@google.com> Tue Feb 09 22:20:33 2016 -0800
tree 113f93ee783933c6995cea0ae8cee64a563b1bc1
parent 497eeddf011c254f524f8d507a08d9d549927b30

ref: Introduce options.ConnectionTimeout and remove options.RetryTimeout.

There were a few subleties during implementation:
(1) We needed to introduce flow.Manager.DialCached to ensure that
ConnectionTimeout == 0 means "only use a cached conn".
(2) To implement flow.Manager.DialCached, we need to introduce
conncache.FindWithRoutingID to ensure that we only return
connection to end servers when a rid is present, instead of
a connection to an intermediate proxy which is what would
happen if we proceeded with the network lookup.
(3) When retrying connection establishment, ConnectionTimeout == 0
must also imply options.NoRetry, otherwise we will unnecessarily
retry a connection establishment that is not in the cache. This
is not true for verror.RetryBackoff errors (errors returned from
applications) since they may be requesting a retry for arbritrary
reasons.

MultiPart: 2/3
Change-Id: I0ced8cbae9db94cabdcb30322f5e6fe6e40437e4