accountsservice will try to run commands under the loginuid of the
caller that initiates a command. This gives a better trail in the
audit log of who is doing what.

Many systems now use CONFIG_AUDIT_LOGINUID_IMMUTABLE, though, making
loginuid spoofing not even possible.

Furthermore, some versions of systemd seem to be failing to handle
putting /proc/self/loginuid in the ReadWritePaths list failing
with an error:

  Failed to mount /run/systemd/unit-root/proc/844/loginuid to /run/systemd/unit-root/proc/844/loginuid: Permission denied
  accounts-daemon.service: Failed to set up mount namespacing: /run/systemd/unit-root/proc/844/loginuid: Permission denied
  accounts-daemon.service: Failed at step NAMESPACE spawning /usr/libexec/accounts-daemon: Permission denied

This commit drops all mentions of loginuid to workaround that error.

Closes: #102