Chrony doesn't synchronize time if the copter was turned on before wifi router. about clever-show

[goldarte]

I suggest checking ip address and restarting chrony on client if returned time in preflight check doesn't synchronized with server

[goldarte]

Need to send repair chrony command sometimes, even if copter started after server and router was turned on.

[goldarte]

There are two reasons of chrony crashes:

1. Server has changed the network and chrony server service has stucked - in this case user must manually restart chrony service on the server and then on the clients.
2. Server has been connected to the network after clients - in this case synchronization can be repaired by restarting chrony service only on the clients

[goldarte]

Added Selected drones -> Restart service -> chrony menu action in v0.4 server app, which restart services on server and on all selected clients