rpm,deb: drop /etc/sudoers.d/cephadm

rpm,deb: drop /etc/sudoers.d/cephadm

Current behavior (without this patch) is:

1. cephadm package installs cephadm at /usr/sbin/cephadm
2. cephadm package installs /etc/sudoers.d/cephadm
3. !!! BUT this file refers to a non-existent executable (/usr/bin/cephadm) !!!
4. the PR that introduced this sudoers file (and this discrepancy) was merged in 2019
5. nobody noticed the discrepancy until now

My conclusion: the file /etc/sudoers.d/cephadm is not needed for cephadm to
work.

Fixes: https://tracker.ceph.com/issues/47112
Signed-off-by: Nathan Cutler <ncutler@suse.com>