mon: Optimized EC pools preprocess_pgtemp incorrectly rejecting pgtemp as nop

mon: Optimized EC pools preprocess_pgtemp incorrectly rejecting pgtemp as nop

Optimized EC pools store pgtemp with primary shards first, this was not
being taken into account by OSDMonitor::preprocess_pgtemp which meant
that the change of pgtemp from [None,2,4] to [None,4,2] for a 2+1 pool
was being rejected as a nop because the primary first encoded version
of [None,2,4] is [None,4,2].

Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>
(cherry picked from commit 00aa1933d3457c377d9483072e663442a4ff8ffd)