Harmonize flags between arping and iputils-arping

[ZuZuD]

There is a conflict between these 2 packages options that can cause network trouble with ease.
iputils-arping use the option "-w" for timeout in second whereas arping use the same option for timeout in microseconds.

Installing a pgpool cluster (for example) from Ubuntu universe repository use by default the arping cmd for the gratuitous ARP Virtual IP.
arping_cmd = 'arping -U $IP$ -w 1'

Using by default the arping package instead of iputils-arping can cause serious trouble to you network (tremendous layer2 broadcast).

A quick fix could be switching the -W (second) and -w flag (microsecond) on arping package.
Seems to be a good idea to harmonize the flags for those 2 similar packages ?

[ThomasHabets]

Actually -w is a deadline in ping/iputils-arping, not a timeout.

I think I did it in microseconds in the past because the ping I was looking at did that. But that was over 16 years ago so I could be wrong or it could have changed.

I'll fix this.

[ZuZuD]

Thank you for your commit.
I should now return to scappy to test my network against crafted L2 fast broadcast ;)