Only add MDNS services if MDNS is enabled (default=true) #1
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This change makes MDNS optional if the HTTP or Telnet services are used. The defaults remain as they are today, but if someone (me) doesn't want to use MDNS then they shouldn't have to. Furthermore, I was chasing a crash where I wasn't calling
MDNS.begin(...)
(only with the HTTP service). This is avoidable entirely if MDNS is not used.