Replace router_should_skip_*() identifiers.
These identifiers are confusing and unreadable. I think these replacements should be better. Closes ticket #40012 (closed).
This is an automated commit, generated by this command:
./scripts/maint/rename_c_identifier.py
router_should_skip_orport_reachability_check_family router_orport_seems_reachable
router_should_skip_dirport_reachability_check router_dirport_seems_reachable
router_should_skip_dirport_reachability_check router_all_orports_seem_reachable