complete kmem cache fix

Patch df31b00f6b5e8111dc9a557d3246719c380c699d
named "make kmem cache name persistent" only fixed the
buffers' mempool cahces but not the initial and primary tasks
pool. Fix that.

Lunchpad issue: 1308465

Reported-by: <xuejiaolong@gmail.com>
Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>