VPP `unix poll-sleep-usec` should be verified and fixed for correct range of values
```
set vpp settings interface eth1 driver dpdk
set vpp settings unix poll-sleep-usec 4294967295
commit
```
commit
```
vyos@r14# commit
[ vpp ]
Traceback (most recent call last):
File "/usr/libexec/vyos/services/vyos-configd", line 139, in run_script
script.apply(c)
File "/usr/libexec/vyos//conf_mode/vpp.py", line 472, in apply
vpp_control = VPPControl(attempts=20, interval=500)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vyos/vpp/control_vpp.py", line 101, in __init__
self.__vpp_api_client.connect('vpp-vyos')
File "/usr/lib/python3/dist-packages/vpp_papi/vpp_papi.py", line 654, in connect
return self.connect_internal(
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vpp_papi/vpp_papi.py", line 619, in connect_internal
rv = self.transport.connect(name, pfx, msg_handler, rx_qlen, do_async)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vpp_papi/vpp_transport_socket.py", line 115, in connect
msg = self._read()
^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vpp_papi/vpp_transport_socket.py", line 214, in _read
hdr = self._read_fixed(16)
^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vpp_papi/vpp_transport_socket.py", line 201, in _read_fixed
got = self.socket.recv_into(view, left)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TimeoutError: timed out
[[vpp]] failed
Commit failed
[edit]
vyos@r14#
```
The second bug, interfaces disappear from the system.
```
vyos@r14# run show int
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address MAC VRF MTU S/L Description
----------- ----------------- ----------------- ------- ----- ----- -------------
dum0 203.0.113.1/32 be:62:fd:ba:50:50 default 1500 u/u
eth0 192.168.122.14/24 52:54:00:77:fa:36 default 1500 u/u
eth2 - 52:54:00:d9:5e:73 default 1500 u/u
```