daemon: add additional syscalls to SECCOMP filter when running in the foreground

daemon: add additional syscalls to SECCOMP filter when running in the foreground

Running lldpd in the foreground as follows:

strace -c /usr/sbin/lldpd -d -cfse -D -C lldpd-peer -I lldpd-peer \
       -S lldpd-system-name -m 192.168.50.6

Requires additional syscalls to be filtered (non relevant syscalls removed):

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  0.47    0.000026           6         4           ppoll
  0.33    0.000018           3         5           rt_sigprocmask
  0.27    0.000015           3         4           getsockopt
------ ----------- ----------- --------- --------- ----------------
100.00    0.005520           8       637        22 total