Detect DoH servers by adding a is_DoH field in ssl.log and add timeout to them so that the DoH connection won't take too long

Running Zeek using this script will result in a is_DoH column in ssl.log that is set to true if the destination IP is a DoH server


This command

Will result in the following ```is_DoH``` column ssl.log

![ssl.log]( https://raw.githubusercontent.com/stratosphereips/zeek-package-detect-DoH/main/images/is_DoH_field.png )

The ```is_DoH``` value of IP `````` is set to ```T``` because it is a DoH server.

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