Ensure consistent error messages from ifconfig(8).

Ensure consistent error messages from ifconfig(8).

If multiple threads are invoking "ifconfig XXX create" a race may occur
which can lead to two different error messages for the same error.

a) ifconfig: SIOCIFCREATE2: File exists
b) ifconfig: interface XXX already exists

This patch ensures ifconfig prints the same error code
for the same case.

Reviewed by:	imp@ and kib@
Differential Revision:	https://reviews.freebsd.org/D27380
MFC after:	1 week
Sponsored by:	Mellanox Technologies // NVIDIA Networking