core: fix selinux check for reload

Fixes:
-bash-4.3# echo 1 >/sys/fs/selinux/enforce
-bash-4.3# runcon -t systemd_test_start_t systemctl start hola

-bash-4.3# sesearch --allow -s systemd_test_reload_t -c service
Found 1 semantic av rules:
   allow systemd_test_reload_t systemd_unit_file_t : service reload ;

-bash-4.3# runcon -t systemd_test_reload_t systemctl reload hola
Failed to reload hola.service: Access denied
See system logs and 'systemctl status hola.service' for details.

-bash-4.3# journalctl -b | grep -i user_avc | grep reload
USER_AVC pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='
avc:  denied  { start } for auid=0 uid=0 gid=0 path="/etc/systemd/system/hola.service" cmdline="systemctl reload hola"
scontext=unconfined_u:unconfined_r:systemd_test_reload_t:s0-s0:c0.c1023
tcontext=system_u:object_r:systemd_unit_file_t:s0
tclass=service

See
https://fedoraproject.org/wiki/Features/SELinuxSystemdAccessControl#Documentation

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