test: mute broken tests on OpenBSD

test/app-tap/fail_main.skipcond

test/app-tap/http_client.skipcond

test/app-tap/popen.skipcond

test/app/cmdline.skipcond

test/app/crypto.skipcond

test/app/digest.skipcond

test/app/fiber.skipcond

test/app/fiber_channel.skipcond

test/app/socket.skipcond

test/box-py/args.test.py

test/box-tap/cfg.skipcond

test/box/cfg.skipcond

test/box/net.box.skipcond

test/box/net_msg_max.skipcond

test/box/schema_reload.skipcond

test/box/tuple.skipcond

test/replication/sync.skipcond

test/wal_off/snapshot_stress.skipcond