dhcp-server crashes if no pool is set

[mattiaswal]

Current Behavior

admin@infix-ad-00-00:/> configure 
admin@infix-ad-00-00:/config/> set dhcp-server 
 enabled  option  subnet
admin@infix-ad-00-00:/config/> set dhcp-server 
 enabled  option  subnet
admin@infix-ad-00-00:/config/> set dhcp-server subnet 10.0.4.0/24
admin@infix-ad-00-00:/config/> leave 
Mar 10 02:52:05 infix-ad-00-00 dnsmasq[6685]: only one tag allowed at line 6 of /etc/dnsmasq.d//net-10-0-4.conf
Mar 10 02:52:05 infix-ad-00-00 dnsmasq[6685]: FAILED to start up
admin@infix-ad-00-00:/> Mar 10 02:52:05 infix-ad-00-00 dnsmasq[6689]: only one tag allowed at line 6 of /etc/dnsmasq.d//net-10-0-4.conf
Mar 10 02:52:05 infix-ad-00-00 dnsmasq[6689]: FAILED to start up
Mar 10 02:52:07 infix-ad-00-00 dnsmasq[6690]: only one tag allowed at line 6 of /etc/dnsmasq.d//net-10-0-4.conf
Mar 10 02:52:07 infix-ad-00-00 dnsmasq[6690]: FAILED to start up
Mar 10 02:52:09 infix-ad-00-00 dnsmasq[6691]: only one tag allowed at line 6 of /etc/dnsmasq.d//net-10-0-4.conf
Mar 10 02:52:09 infix-ad-00-00 dnsmasq[6691]: FAILED to start up
Mar 10 02:52:11 infix-ad-00-00 dnsmasq[6692]: only one tag allowed at line 6 of /etc/dnsmasq.d//net-10-0-4.conf
Mar 10 02:52:11 infix-ad-00-00 dnsmasq[6692]: FAILED to start up

admin@infix-ad-00-00:~$ cat /etc/dnsmasq.d/net-10-0-4.conf 
# Subnet 10.0.4.0/24

# Common options for this subnet

# Subnet pool (null) - (null)
dhcp-range=set:net-10-0-4,(null),(null),3600
admin@infix-ad-00-00:~$ cli

See the 'help' command for an introduction to the system

Should be validated in YANG model

Expected Behavior

YANG does not allow me to configure incorrect

Steps To Reproduce

No response

Additional information

No response

[troglobit]

I'm doing a three-step fix to this:

1. Add pool validation to YANG model, if pool, then start + end must be set
2. Add server validation, if subnet, then pool OR one static lease
3. Add pool inference to /24 networks, for CLI users