ipsec: remove redundant policy array in fast path spd

ipsec: remove redundant policy array in fast path spd

Fast path spd was explicitely storing array of policy id vectors.
This information was redundand, as this inofrmation is already stored
in bihash table. This additional array was affecting performance
when adding and removing fast path policies.
The other place that needed refactoring after removing this array  was
cli command showing fast path policies.

Type: feature

Signed-off-by: Piotr Bronowski <piotrx.bronowski@intel.com>
Change-Id: I78d45653f71539e7ba90ff5d2834451f83ead4be