Add support for DNS resolution with cephfs
Trying to mount a cephfs mount with fstab using a DNS name currently fails with:
libceph: parse_ips bad ip '<name>'
Could the CONFIG_CEPH_LIB_USE_DNS_RESOLVER kernel option be enabled?
(from redmine: issue id 10350, created on 2019-04-26, closed on 2019-06-19)