relay: Disable relay config when the module is disabled

This commit:
* disables the ORPort, DirPort, DirCache, and BridgeRelay options,
* sets ClientOnly 1,
* disables relay_config.c and relay/transport_config.c,
* disables test_rebind.sh, and
* modifies the expected results for test_parseconf.sh,
when the relay module is disabled.

Part of 32213.