[PATCH] Allow to setup connect timeout for TCP transport

[Pavel Strashkin]

Hello everyone,

There is no way to setup connect timeout when you're trying to connect
to dbus via TCP. For an example, if you have the following connection
string "tcp:host=A,port=B", and host "A" is unavailable by some reason
then your client will get in stuck. When it come back or when
ETIMEDOUT error happens depends on OS. Get in stuck is a bad thing so
there has to be a way to configure connect timeout via "timeout"
keyword in connection string. The value is in miliseconds. Default
timeout may be 60s.
Attached patch introduces such feature so it's possible to use the
following connection string: "tcp:host=A,port=B,timeout=5000" (5s
timeout). I believe that it's a very helpfull feature. I'm sorry that
my patch is for 1.2.24, but if everything is clear (logic, code, ...)
then i'll backport it to master branch.
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