Removed some unneeded delays to speed up boot time. Increased number of DHCP_TRIES to compensate.

Now boots under 1s with a static IP address. DHCP slows that down of course.
My home router doesnt seem to like answering DHCP requests too often, so I doubled DHCP_TRIES, and it hasnt taken more than 10 attempts yet.
DHCP_TRIES was previously hard coded, I moved it into a separate define to keep things neat.
The connection check previously had always waited for 1 sec regardless, which is stupid as it almost always works the first time if there is a cable plugged in.