multi interface: missed storing connection time

Dirk Manske reported a regression. When connecting with the multi
interface, there were situations where libcurl wouldn't store
connect time correctly as it used to (and is documented to) do.

Using his fine sample program we could repeat it, and I wrote up
test case 573 using that code. The problem does not easily show
itself using the local test suite though.

The fix, also as suggested by Dirk, is a bit on the ugly side as
it adds yet another call to Curl_verboseconnect() and setting the
TIMER_CONNECT time.  That situation is subject for some closer
inspection in the future.

RELEASE-NOTES

@@ -24,6 +24,7 @@ This release includes the following bugfixes:
  o MSVC makefiles now use ws2_32.lib instead of wsock32.lib
  o -O crash on windows
  o SSL handshake timeout underflow in libcurl-NSS
+ o multi interface missed storing connection time
 
 This release includes the following known bugs:
 
@@ -33,6 +34,6 @@ This release would not have looked like this without help, code, reports and
 advice from friends like these:
 
  Rainer Canavan, Paul Howarth, Jerome Vouillon, Ruslan Gazizov, Yang Tse,
- Kamil Dudka, Alex Bligh, Ben Greear, Hoi-Ho Chan, Howard Chu
+ Kamil Dudka, Alex Bligh, Ben Greear, Hoi-Ho Chan, Howard Chu, Dirk Manske
 
         Thanks! (and sorry if I forgot to mention someone)