Increase FD_SETSIZE constant so we don't run out of socket descriptors

We don't use that many, but Windows likes to open a lot of them behind
our back.

Redmine #4633.
Redmine #4633: Do not call update.cf when bootstrapping on Windows.

Otherwise the daemons will not be running under the SYSTEM account.
We need to wait and let cf-execd launch them, since it is running
as a system service.

This means that getting up and running will take longer on Windows,
but there is little we can do about that.
Merge pull request #1621 from kacfengine/windows_bootstrapping

Redmine #4633: Fix Windows bootstrapping