Adding support for PMD auto load balancing

Port rx queues that have not been statically assigned to PMDs are currently
assigned based on periodically sampled load measurements.
The assignment is performed at specific instances – port addition, port
deletion, upon reassignment request via CLI etc.

Due to change in traffic pattern over time it can cause uneven load among
the PMDs and thus resulting in lower overall throughout.

This patch enables the support of auto load balancing of PMDs based on
measured load of RX queues. Each PMD measures the processing load for each
of its associated queues every 10 seconds. If the aggregated PMD load reaches
95% for 6 consecutive intervals then PMD considers itself to be overloaded.

If any PMD is overloaded, a dry-run of the PMD assignment algorithm is
performed by OVS main thread. The dry-run does NOT change the existing
queue to PMD assignments.

If the resultant mapping of dry-run indicates an improved distribution
of the load then the actual reassignment will be performed.

The automatic rebalancing will be disabled by default and has to be
enabled via configuration option. The interval (in minutes) between
two consecutive rebalancing can also be configured via CLI, default
is 1 min.

Following example commands can be used to set the auto-lb params:
ovs-vsctl set open_vswitch . other_config:pmd-auto-lb="true"
ovs-vsctl set open_vswitch . other_config:pmd-auto-lb-rebalance-intvl="5"

Co-authored-by: Rohith Basavaraja <rohith.basavaraja@gmail.com>
Co-authored-by: Venkatesan Pradeep <venkatesan.pradeep@ericsson.com>
Signed-off-by: Rohith Basavaraja <rohith.basavaraja@gmail.com>
Signed-off-by: Venkatesan Pradeep <venkatesan.pradeep@ericsson.com>
Signed-off-by: Nitin Katiyar <nitin.katiyar@ericsson.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Tested-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

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