Platform Cisco wrong numeric protocol rendering

Cisco platform policy numeric protocol always rendered as ```None```
Example policy:
```
header {
comment:: "Test policy for numeric proto"
target:: cisco ProtoTest extended
target:: ciscoxr ProtoTest extended
}
term allow-ntp-numeric-proto {
comment:: "Allow example ntp servers"
destination-address:: NTP_SERVERS
protocol:: 50
action:: accept
}
term default {
action:: deny
}
```
Resulting acl for cisco:
```
! $Id:$
! $Date:$
! $Revision:$
no ip access-list extended ProtoTest
ip access-list extended ProtoTest
remark $Id:$
remark Test policy for numeric proto

remark allow-ntp-numeric-proto
remark Allow example ntp servers
permit None any host 10.0.0.1
permit None any host 10.0.0.2

remark default
deny ip any any

exit
```
And resulting Ciscoxr acl is correct:
```
! $Id:$
! $Date:$
! $Revision:$
no ipv4 access-list ProtoTest
ipv4 access-list ProtoTest
remark $Id:$
remark Test policy for numeric proto

remark allow-ntp-numeric-proto
remark Allow example ntp servers
permit 50 any host 10.0.0.1
permit 50 any host 10.0.0.2

remark default
deny ipv4 any any

exit
```