added option for specifying a TCP connection timeout
use retry_timeout for (re)connects and added max_retries as an XML option
added connect_timeout as an "global" XML test option
added connect timeout option to ts_{ssl,ssl6,tcp6}:connect
updated the documention on max_retries and retry_timeout
added max_retries to defaults
Merge pull request #95 from tisba/connection-timeout

Add connection_timeout option