hs: HiddenServiceNumIntroductionPoints can't go below the default value of 3
HiddenServiceNumIntroductionPoints option, one should be able to go from 0 to the maximum allowed that is 10.
Currently, our code restrict from default value of 3 to the maximum value of 10. Bug is here:
service->n_intro_points_wanted = (unsigned int) tor_parse_long(line->value, 10, NUM_INTRO_POINTS_DEFAULT, NUM_INTRO_POINTS_MAX, &ok, NULL);
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