#1212 CURLOPT_MAXCONNECTS isn't used

[Daniel Stenberg]

(Steven Gu reported in
http://curl.haxx.se/mail/lib-2013-03/0277.html)

When the always-multi rewrite of libcurl 7.29.0, the old CURLOPT_MAXCONNECTS was broken and it needs to be fixed.

1. write test case(s) to verify the existance of the bug
2. make sure the limit is set for the internal multi handle that is used for curl_easy_perform
3. make sure the test case proves the bug to be gone

[Daniel Stenberg]

Fixed now by Linus in commit e87e76e2dc108