pptp: make echo-failure=0 disable the check explicitly

load_config() accepts echo-failure=0, but the test for it was
"++echo_sent == conf_echo_failure", which can never match once the
counter has been incremented, so a zero left dead peers undetected
without saying so anywhere. Test the option first and compare with >=,
which keeps the behaviour for every configured value and makes the
disabled case readable, and document it in accel-ppp.conf.5.

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