LLDP behaves incorrectly when used with interface 'all'.
LLDP is inactive on all interfaces by default.
If I use
```
delete service lldp
set service lldp
commit
```
LLDP becomes active on **all** interfaces. I'm unsure if this is what is supposed to happen, but this is not the bug yet.
If I use
```
delete service lldp
set service lldp interface eth1
set service lldp interface all disable
commit
```
LLDP is still active on `eth1`, though I think it should be disabled.
If I use
```
delete service lldp
set service lldp interface all
commit
```
LLDP becomes **inactive** on **all** interfaces. This should not happen.
The problem arises from different representation and missing translation of the 'all' interface in conf_mode and in lldpd config syntax.
conf_mode uses the word 'all' while lldpd config uses an asterisk '*'.
The template in `vyos-1x`:`./src/conf_mode/lldp.py` does not convert from 'all' to '*' and so lldpd is looking for an interface named 'all' which it cannot find.
The same goes for `set service interface all disable`. lldpd tries to disable service for the interface named 'all', which it cannot find, but leaves it enabled for any other interface.
But why does it enable lldp on all interfaces when only specifying `service lldp` but without **any** interface?
The reason lies in the default behavior of lldpd: if started without any interface specified, it services all interfaces.
PR will follow.