crimson/osd: pick only v2 addresses.

crimson/osd: pick only v2 addresses.

Otherwise we'll run into an assertion failure when binding:

```
INFO  2021-10-05 15:14:51,075 [shard 0] osd - picked address v2:0.0.0.0:0/0
INFO  2021-10-05 15:14:51,075 [shard 0] osd - picked address v1:0.0.0.0:0/0
ceph-osd: /home/jenkins-build/build/workspace/ceph-dev-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos8/DIST/centos8/MACHINE_SIZE/gigantic/release/17.0.0-8025-geb9c0f59/rpm/el8/BUILD/ceph-17.0.0-8025-geb9c0f59/src/crimson/net/SocketMessenger.cc:89: crimson::errorator<crimson::unthrowable_wrapper<const std::error_code&, ((const std::error_code&)(& crimson::ec<std::errc::address_in_use>))>, crimson::unthrowable_wrapper<const std::error_code&, ((const std::error_code&)(& crimson::ec<std::errc::address_not_available>))> >::future<> crimson::net::SocketMessenger::try_bind(const entity_addrvec_t&, uint32_t, uint32_t): Assertion `addrs.size() == 1' failed.
Aborting on shard 0.
```

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>