i40e/base: find partition id in NPAR mode and disable FCoE

i40e/base: find partition id in NPAR mode and disable FCoE

In NPAR mode the driver instance might be controlling the base
partition or one of the other "fake" PFs. There are some things
that can only be done by the base partition, aka partition_id 1.
This code does a bit of work to find how many partitions are there
in per port and what is the current partition_id. In addition,
FCOE is disabled by default, as it was pushed out from the firmware.

Test report: http://www.dpdk.org/ml/archives/dev/2015-May/017384.html

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Acked-by: Jijiang Liu <jijiang.liu@intel.com>
Tested-by: Min Cao <min.cao@intel.com>