dpdk: fix blacklists

dpdk: fix blacklists

When we have both format blacklisted devices like:
blacklist 1234:5678
blacklist 1234:56:78.0

unformat with fmt=%x:%x matches for both strings
 and the rest 78.0 substring is kept in input
 and it can't be parsed for init args

This patch checks first if device format matches PCI address and
 just then if it matches Vendor and Product

Type: fix
Change-Id: If111762c0e0a424b052e4f6dc0f67731bf89dc2a
Signed-off-by: Vladimir Ratnikov <vratnikov@netgate.com>