ifconfig: split argument parsing and actual execution.

[kp]

Are you planning on doing more cleanup work in ifconfig?

This is clearly a step in the right direction, but there are a lot more steps to take in ifconfig.

[melifaro]

In D39932#909217, @kp wrote:

Are you planning on doing more cleanup work in ifconfig?

To some extent :-) This change is first in the series to switch ifconfig to Netlink.

This is clearly a step in the right direction, but there are a lot more steps to take in ifconfig.

After looking into the code - yeah there certainly are :-)