conf/distro/poky.conf: use example.com for connectivity check

Instead of pinging both the Yocto Project download and bugzilla sites, use
https://www.example.com/.  This is a reserved domain name and hosted by IANA, so
is a key part of the Internet and should be available everywhere (whereas for
example google.com is generally blocked by the Great Firewall of China).  Also
using a https: site verifies that any local proxies are configured for HTTPS as
well as HTTP.

In my testing this reduces the time taken for connectivity checks from 3 seconds
to 1 second.

(From meta-yocto rev: b253c6073be44090a19d1743deb58ef566853056)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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