pptp: fix and allow to disable echo failures counting

 Sent echos counter is overloaded with random icmp id, so
 echo-failure setting is either ignored or causes random pptp
 channel stops within valid accumulated fail count range, i.e
 on the the first fail. Since icmp id is not actually used for
 checking, fix issue by dropping overload.
 Default echo-failure value is 3, so allow endless echo fails
 without channel drop by setting echo-failure to 0.

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