Firewall unexpectedly changes some sysctl options.
Initial configuration:
```
set system sysctl parameter net.netfilter.nf_conntrack_tcp_loose value '0'
set firewall ipv4 input filter rule 5 action 'accept'
set firewall ipv4 input filter rule 5 inbound-interface interface-name 'lo'
set firewall ipv4 input filter rule 5 source address '127.0.0.0/8'
```
Be sure that option tcp_loose is `0` and change any firewall rule.
After commit it uses the value `1`
```
vyos@r4# echo 0 | sudo tee /proc/sys/net/netfilter/nf_conntrack_tcp_loose
0
vyos@r4# cat /proc/sys/net/netfilter/nf_conntrack_tcp_loose
0
vyos@r4# set firewall ipv4 input filter rule 5 description foo
[edit]
vyos@r4# commit
[edit]
vyos@r4#
[edit]
vyos@r4# cat /proc/sys/net/netfilter/nf_conntrack_tcp_loose
1
[edit]
vyos@r4#
```